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Original Paper Koustuv Saha 1* , B.Tech; John Torous 2 , M.D.; Eric D. Caine 3 , M.D.; Munmun De Choudhury 1 , Ph.D. 1 School of Interactive Computing, Georgia Institute of Technology, Atlanta, GA, USA 2 Beth Israel Deaconess Medical Center, Department of Psychiatry, Harvard Medical School, Boston, MA, USA 3 Department of Psychiatry, University of Rochester Medical Center, Rochester, NY, USA * [email protected] Social Media Reveals Psychosocial Effects of the COVID-19 Pandemic Abstract Background: The novel coronavirus disease 2019 (COVID-19) pandemic has caused several disruptions in personal and collective lives worldwide. The uncertainties surrounding the pandemic have also led to multi-faceted mental health concerns, which can be exacerbated with precautionary measures such as social distancing and self-quarantining, as well as societal impacts such as economic downturn and job loss. Despite noting this as a “mental health tsunami,” the psychological effects of the COVID-19 crisis remains unexplored at scale. Consequently, public health stakeholders are currently limited in identifying ways to provide timely and tailored support during these circumstances. Objective: Our work aims to provide insights regarding people’s psychosocial concerns during the COVID-19 pandemic by leveraging social media data. We aim to study the temporal and linguistic changes in symptomatic mental health and support-seeking expressions in the pandemic context. Methods: We obtain ∼60M Twitter streaming posts originating from the U.S. from March, 24 – May, 25, 2020, and compare these with ∼40M posts from a comparable period in 2019 to causally attribute the effect of COVID-19 on people’s social media self-disclosure. Using these datasets, we study people’s self-disclosure on social media in terms of symptomatic mental health concerns and expressions seeking support. We employ transfer learning classifiers that identify the social media language indicative of mental health outcomes (anxiety, depression, stress, and suicidal ideation) and support (emotional and informational support). We then examine the changes in psychosocial expressions over time and language, comparing the 2020 and 2019 datasets. Results: We find that all of the examined psychosocial expressions have significantly increased during the COVID-19 crisis – mental health symptomatic expressions have increased by ~14%, and support seeking expressions have increased by ~5%, both thematically related to COVID-19. We also observe a steady decline and eventual plateauing in these expressions during the COVID-19 . CC-BY-NC-ND 4.0 International license It is made available under a is the author/funder, who has granted medRxiv a license to display the preprint in perpetuity. (which was not certified by peer review) The copyright holder for this preprint this version posted August 11, 2020. ; https://doi.org/10.1101/2020.08.07.20170548 doi: medRxiv preprint NOTE: This preprint reports new research that has not been certified by peer review and should not be used to guide clinical practice.

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Original PaperKoustuvSaha1*,B.Tech;JohnTorous2,M.D.;EricD.Caine3,M.D.;MunmunDeChoudhury1,Ph.D.1SchoolofInteractiveComputing,GeorgiaInstituteofTechnology,Atlanta,GA,USA2BethIsraelDeaconessMedicalCenter,DepartmentofPsychiatry,HarvardMedicalSchool,Boston,MA,USA3DepartmentofPsychiatry,UniversityofRochesterMedicalCenter,Rochester,NY,USA*[email protected]

Social Media Reveals Psychosocial Effects of the COVID-19 Pandemic

Abstract Background:Thenovelcoronavirusdisease2019(COVID-19)pandemichascausedseveraldisruptionsinpersonalandcollectivelivesworldwide.Theuncertaintiessurroundingthepandemichavealsoledtomulti-facetedmentalhealthconcerns,whichcanbeexacerbatedwithprecautionarymeasuressuchassocialdistancingandself-quarantining,aswellassocietalimpactssuchaseconomicdownturnandjobloss.Despitenotingthisasa“mentalhealthtsunami,”thepsychologicaleffectsoftheCOVID-19crisisremainsunexploredatscale.Consequently,publichealthstakeholdersarecurrentlylimitedinidentifyingwaystoprovidetimelyandtailoredsupportduringthesecircumstances.Objective:Ourworkaimstoprovideinsightsregardingpeople’spsychosocialconcernsduringtheCOVID-19pandemicbyleveragingsocialmediadata.Weaimtostudythetemporalandlinguisticchangesinsymptomaticmentalhealthandsupport-seekingexpressionsinthepandemiccontext.Methods:Weobtain∼60MTwitterstreamingpostsoriginatingfromtheU.S.fromMarch,24–May,25,2020,andcomparethesewith∼40Mpostsfromacomparableperiodin2019tocausallyattributetheeffectofCOVID-19onpeople’ssocialmediaself-disclosure.Usingthesedatasets,westudypeople’sself-disclosureonsocialmediaintermsofsymptomaticmentalhealthconcernsandexpressionsseekingsupport.Weemploytransferlearningclassifiersthatidentifythesocialmedialanguageindicativeofmentalhealthoutcomes(anxiety,depression,stress,andsuicidalideation)andsupport(emotionalandinformationalsupport).Wethenexaminethechangesinpsychosocialexpressionsovertimeandlanguage,comparingthe2020and2019datasets.Results:WefindthatalloftheexaminedpsychosocialexpressionshavesignificantlyincreasedduringtheCOVID-19crisis–mentalhealthsymptomaticexpressionshaveincreasedby~14%,andsupportseekingexpressionshaveincreasedby~5%,boththematicallyrelatedtoCOVID-19.WealsoobserveasteadydeclineandeventualplateauingintheseexpressionsduringtheCOVID-19

. CC-BY-NC-ND 4.0 International licenseIt is made available under a is the author/funder, who has granted medRxiv a license to display the preprint in perpetuity. (which was not certified by peer review)

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NOTE: This preprint reports new research that has not been certified by peer review and should not be used to guide clinical practice.

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pandemic,whichmayhavebeenduetohabituationorduetosupportivepolicymeasuresenactedduringthisperiod.OurlanguageanalyseshighlightthatpeopleexpressconcernsthatarecontextuallyrelatedtotheCOVID-19crisis.Conclusions:WestudiedthepsychosocialeffectsoftheCOVID-19crisisbyusingsocialmediadatafrom2020,findingthatpeople’smentalhealthsymptomaticandsupport-seekingexpressionssignificantlyincreasedduringtheCOVID-19periodascomparedtosimilardatafrom2019.However,thiseffectgraduallylessenedovertime,suggestingthatpeopleadaptedtothecircumstancesandtheir“newnormal”.Ourlinguisticanalysesrevealedthatpeopleexpressedmentalhealthconcernsregardingpersonalandprofessionalchallenges,healthcareandprecautionarymeasures,andpandemic-relatedawareness.Thisworkshowsthepotentialtoprovideinsightstomentalhealthcareandstakeholdersandpolicymakersinplanningandimplementingmeasurestomitigatementalhealthrisksamidstthehealthcrisis.

Keywords:socialmedia;Twitter;language;psychosocialeffects;mentalhealth;transferlearning;depression;anxiety;stress;socialsupport;emotions;COVID-19;coronavirus;crisis

Introduction Theimpactsofglobalpublichealthemergenciesextendbeyondmedicalrepercussions–theyaffectindividualsandsocietiesonmanylevels,causingdisruptions[1,2].InanarticlewrittenbytheAmericanPsychologicalAssociationfollowingtheEbolaoutbreak[3],theepidemicwasdescribedasan“epidemicoffear”–intheUnitedStates,itwasdescribedbythemediaas“fearbola,”todescribeaparanoiathatinfectedthecountry.Reportsofsimilarfeelingsofanxiety,stress,anduncertaintyhavebeenrepeatedlyreportedduringotherglobaloutbreaksandpandemics[4].Theongoingoutbreakofthecoronavirus,SARS-COV-2,hasledtoapandemicofillness(coronavirusdisease,orCOVID-19)thathasgloballycaused16Mcasesand700Kdeaths,reportedasoftheendofJuly2020[5].AccordingtorecentsurveysfromtheCensusBureauandtheCentersforDiseaseControlandPreventionandotherstudies,theCOVID-19crisishasbeenreportedtobeassociatedwithrapidrisesinpsychologicaldistressacrossmanynations[6],withwomen,theyoung,thelesseducated,andsomeethnicminoritygroupsreportinggreatermentalhealthstrain[7].Ontheonehand,personsareworriedaboutthedirecteffectsofpotentialinfection,includingfearsofdeath,lastingdisabilities,orexacerbatingchronicillnesses.Ontheother,actionstomitigatethespreadofCOVID-19,includingsocialdistancing,quarantines,andbusinessclosureswithresultingjoblosses,areapowerfulsourceoflifedisruptionsandemotionaldistress.

FearandanxietyaboutadiseaseasinfectiousasCOVID-19cantriggernew-onsetorexacerbateexistingmentalillness[8].Therefore,thepracticalimpactofthecrisisisfargreaterthantheactualnumberofinfectioncasesorfatalities[9].Whileexpressionsofdistressmaystemfromconcernandworryrelatingtothedirectimpactsofthedisease,theymayrelateasmuchtodisruptionofregularroutines,sleepandeatingpatterns,havingout-of-schoolchildrenathomefull-time,economic

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hardshipsandunusualvolatilityinfinancialmarkets,andforcedgeographicaldisplacementorconfinement.Indeed,somepeopleareatriskofdevelopingpost-traumaticdistressduetoexposuretothemulti-faceteduncertainties,orfromconfrontingdyingpersonsorlostlovedones.Whilediseasemitigatingeffortssuchas“socialdistancing”and“self-quarantining”arerecommended[10–13],individualsinmedicalisolationmayexperienceincreasedsymptomsofanxietyanddepression,aswellasfeelingsoffear,abandonment,loneliness,andstigmatization[14,15].

DespiteconcernsaboutthemyriadofsocialandbehavioralissuesassociatedwiththeCOVID-19pandemic[16,17],researchhasbeenscanttoexamineitspsychosocialimpactsorhowtopredictandmitigatethem.AlthoughitisanticipatedthatCOVID-19willhavebroadlyramifyingeffects[18,19],publichealthworkersandcrisisinterventionistsarelimitedintheirabilitytoextendservicesandsupportinatimely,preemptivefashion.Althoughsurveysareastepforwardtosupportsuchefforts[7],duetotheirretrospectiverecallbias,limitedscalability,andwithoutbeingabletoprovidereal-timeinsights,publichealthworkersarenotonlyunabletoprioritizeservicesforthemostvulnerablepopulations,butmorespecifically,lessequippedtodirectpreventioneffortstowardsindividualswithgreaterpropensitiesforadversepsychologicalimpacts.

Thispaperseekstoaddresstheabovegapbydrawinginsightsintopeople’sexpressedmentalhealthconcernsbyleveragingsocialmediadata.Theriseinonlineandsocialmediaactivityhasprovidedanunprecedentedopportunitytoenhancetheidentificationandmonitoringstrategiesofvariousmentalandpsychosocialdisorders[20,21].Over80%ofU.S.adultsusesocialmediadaily[22],placingitaheadoftexting,email,andinstantmessaging,anddiscloseconsiderablymoreaboutthemselvesonlinethanoffline[23,24].Socialmediaprovidesareal-timeplatformwherepeopleoftencandidlyself-disclosetheirconcerns,opinions,andstrugglesduringthispandemic[25].Ourresearchis,therefore,foundedonpriorworktounderstandpeople’spsychosocialdistressintermsoftheirsymptomaticmentalhealthexpressionsofanxiety,depression,stress,andsuicidalideation,andtheirexpressionsseekingemotionalandinformationalsupport[20,26–29].

Methods Data Tostudypeople’spsychosocialexpressionsonsocialmedia,weobtainTwitterdata.Twitterisoneofthemostpopularsocialmediaplatforms,anditspublic-facing,micro-bloggingbaseddesignenablespeopletocandidlyself-discloseandself-expresstheirlifeexperiencesandconcerns[30].

TreatmentData.Inparticular,wefocusourstudyontheU.S.populationandleveragetheTwitterstreamingAPI.Usinggeo-boundedcoordinates,wecollect1%ofreal-timeTwitterdataoriginatingfromtheU.S.Wecollect59,096,694TwitterpostsbetweenMarch24,2020,andMay24,2020.BecausethisdatasetcomesfromthesameperiodwhentheCOVID-19outbreakoccurred,welabelthisdatasetasthe

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Treatmentdataset.WenotethatthisperiodsawanexponentialgrowthinreportedCOVID-19infectioncases(~50Kto~1M)andfatalities(~1Kto~56K)intheU.S.[31].Duringthesetwomonths,federalandstatepoliciesandlawswereenactedtocontrolormitigatethespreadoftheoutbreak,includingschoolandworkclosures,stay-at-homeorders,andCoronavirusAid,Relief,andEconomicSecurityAct[32].

ControlData.TounderstandthesocialmediaexpressionsparticularlyattributedtotheCOVID-19crisis,weobtainacontroldatasetthatoriginatesfromthesamegeographicallocation(U.S.)andsimilartimeperiod,butfromthepreviousyear(2019).Priorwork[33]motivatesthisapproachofobtainingcontroldatathatactsasabaselineandlikelyminimizesconfoundingeffectsduetogeo-temporalseasonalityinlifestyle,activities,experiences,andunrelatedeventsthatmayhavesomepsychosocialbearing.Weobtainasimilarly-sizeddatasetof40,875,185TwitterpostssharedbetweenMarch24,2019,andMay24,2019.

Psychosocial Effects of COVID-19 TounderstandthepsychosocialimpactsoftheCOVID-19outbreak,weconducttwotypesofanalysisonourTwitterdataset,whichwedescribebelow.Ourworkbuildsuponthevast,rapidlygrowingliteraturestudyingmentalhealthconcernsandpsychosocialexpressionswithinsocialmediadata[20,23,26–28,30,34–37].

Symptomatic Mental Health Expressions Drawingontheworkreferencedabove,wehypothesizethatpeople’sself-disclosureexpressionsonsocialmediacanrevealsymptomaticmentalhealthexpressionsattributedtotheCOVID-19crisis.Weexaminesymptomaticexpressionsofanxiety,depression,stress,andsuicidalideation.Thesearenotonlysomeofthemostcriticalmentalhealthconcernsbutalsohavebeenattributedtobeconsequencesofthepandemicoutbreak[16,38,39].

Toidentifymentalhealthsymptomaticexpressionsinsocialmedialanguage,Sahaetal.(2019)builtmachinelearningclassifiers[28]usingtransferlearningmethodologies---themainideahereistoinfermentalhealthattributesinanunlabeleddatabytransferringaclassifiertrainedonadifferentlabeleddataset.Theseclassifiersaren-gram(n=1,2,3)basedbinarySupportVectorMachine(SVM)modelswherethepositiveclassofthetrainingdatasetsstemsfromappropriateRedditcommunities(r/depressionfordepression,r/anxietyforanxiety,r/stressforstress,andr/SuicideWatchforsuicidalideation),andthenegativeclassoftrainingdatasetscomesfromnon-mentalhealth-relatedcontentonReddit—acollatedsampleof20Mposts,gatheredfrom20subredditsfromthelandingpageofRedditduringappropriatelythesameperiodasthementalhealthsubredditposts,suchasr/AskReddit,r/aww,r/movies,andothers.Theseclassifiersperformatahighaccuracyofapproximately0.90onaverageonheld-outtestdata[28].

ClinicalValidity.Sahaetal.’sclassifiers,usedhere,havealsobeenshowntotransferwellonTwitterwithan87%agreementbetweenmachine-predictedlabelsandexpertappraisal[28],whereexpertsannotatedpostsintheclassificationtest

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datausingDSM-5[40]criteriaofmentalhealthsymptoms.Bagroyetal.[41]reportedadditionalvalidationofsuchderivedinsightswithfeedbackfromclinicalexperts.Inthiswork,theoutcomesofthementalhealthexpressionclassifierswerecomparedwiththosegivenbyhumancodersonthesame(random)sampleofsocialmediaposts;thelattercodedthepostsbasedonacodebookdevelopedusingpriorqualitativeandquantitativestudiesofmentalhealthdisclosuresonsocialmediaandliteratureinpsychologyonmarkersofmentalhealthexpressions.Codersnotonlyagreedwiththeoutcomesoftheclassifiers(Cohen’sκwas0.83),butalsonotedthattheclassifierscouldidentifyexplicitexpressionsoffirst-handexperienceofpsychologicaldistressormentalhealthconcerns(“igetoverwhelminglydepressed”)aswellasexpressionsofsupport,help,oradviceseekingarounddifficultlifechallengesandexperiences(“arethereanyresourcesIcanusetotalktosomeoneaboutdepression?”).Furtherdetailsabouttheseclassifiers,includingtheirdetailedperformance,predictivefeaturesdemonstratingmodelinterpretability,andefficacyoftransfertoTwitterdata,maybefoundin[28,33,41].WeusetheseclassifierstomachinelabelbothourTreatmentandControldatasets.

Support-seeking Expressions Socialsupportisconsideredanessentialcomponentinhelpingpeoplecopewithpsychologicaldistress[42].Researchreportsthatsupportiveinteractionscanevenhavea“bufferingeffect”[43];thatis,theycanbeprotectiveagainstthenegativeconsequencesofmentalhealth.Withthewideadoptionofwebandsocialmediatechnologies,support-seekingisincreasinglyhappeningonlineandhasbeenshowntobeefficacious[23,44].Infact,ameta-analysisindicatesthatonlinesupportiseffectiveindecreasingdepressionandincreasingself-efficacyandqualityoflife[45].Inthecontextofsuicide,certaintypesofsocialsupportinRedditcommunitiesmayreducethechancesoffuturesuicidalideationamongthoseseekingmentalhealthhelp[46].Ohetal.furthershowedthatsurveyedFacebookusersdemonstrateapositiverelationshipbetweenhavinghealthconcernsandseekinghealth-relatedsocialsupport[47].Indeed,duringglobalcrisessuchasCOVID-19,whenmanyofthephysicalsitesforhealthcare(includingmentalhealth)havebeenclosedorhaveveryrestrictedaccess,itislikelythatonlinesupporthasproliferated[48].Fearofpotentialinfectionmayfurtherhavealienatedindividualsinneedtopursueformaltreatment,therapy,andsupport,perhapschannelizingtheirsupportseekingeffortsonlineandonsocialmedia.

Accordingtothe“SocialSupportBehavioralCode”[49],twoformsofsupportthathavereceivedtheoreticalandempiricalattentionareemotionalandinformationalsupport.Emotionalsupport(ES)correspondstoempathy,encouragement,andkindness,whileinformationalsupport(IS)correspondstoinformation,guidance,andsuggestions[50,51].Thesetwoformsofsupporthavebeenfoundtobemostprevalentandeffectiveinseveralstudiesofonlinesupportandsocialmedia[46,50,52,53].Socialmediaenableindividualstoself-discloseandexpressinmakingtheiremotionalandinformationalneedsknownandsought[53].Andalibietal.foundthatthesetwokindsofsupportcanco-occurwithotherformsofsupport,suchaspostsseekingemotionalsupportoftenseekesteemandnetworksupport[52],and

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Attaietal.notedthatTwitteriseffectiveinseekingandprovidinghealth-relatedinformationalneeds[54],contextuallyrelatedwithourproblemofinterest.

Toidentifysupportexpressionsonsocialmedia,weuseanexpert-appraiseddatasetandclassifierbuiltinpriorwork[50,55].ThesearebinarySVMclassifiersidentifyingthedegree(high/low)ofESandISinsocialmediaposts.Whenthepredictionsoftheseclassifierswerecross-validatedwithexpertannotationsfromSharmaandDeChoudhury’sdata[50],theclassifierswerefoundtohavek-foldcross-validationaccuraciesof0.71and0.77inESandISclassificationsrespectively[55].Similartothesymptomaticexpressionsclassifiers,theclassifiersofsupportexpressionsaretransferredfromRedditandtypicallyperformswellinourdatasetduetothehighlinguisticequivalencebetweenRedditandTwitterdatasets[35].Wefurthermanuallyinspectarandomsetof125Twitterpostsinourdatasetusingthemethodsoutlinedinpriorwork[28,41]torateeachTwitterpostwithbinaryhighorlowESandIS.Wefindthatthemanualratingsandclassifierratingsshowahighagreementof88%and93%,respectively,indicatingstatisticalsignificanttransferclassificationonTwitter.WeusetheseclassifierstolabelthepresenceofESandISinourTreatmentandControldatasets.

Examining Psychosocial Expressions over Time and Language Next,wedescribemethodstoexaminehowtheCOVID-19pandemicmayhavecausedchangesinpsychologicalexpressionsbycomparingourTreatment(outbreakyear)andControl(no-outbreakyear)datasets.Forbothourdatasets,weaggregatethenumberofpoststhatexpresssymptomaticandsupport-seekingexpressionsbydayandbytype.Wecomparethepervasivenessofeachkindofmeasureinthedatasets,alongwithconductingstatisticalsignificanceintheirdifferencesusingpairedt-tests.

Temporal Variation TocomparethedailyvariationofmeasuresbetweenTreatmentandControldatasets,wetransformourdataintostandardizedz-scores.OurdatasetsrelyontheTwitterstreamingAPI,andaresubjecttodailyinconsistenciesofavailabledataeachday[56].Transformedz-scoresarenotsensitivetosuchabsolutevaluesandinconsistencies,andessentiallyquantifythenumberofstandarddeviationsbywhichthevalueoftherawscoreisaboveorbelowthemean.Similarstandardizationtechniqueshavebeenadoptedinpriorsocialmediatime-seriesstudies[33,57].z-scoresarecalculatedas(x−μ)/σ,wherexistherawvalue,μisthemeanandσisthestandarddeviationofthepopulation.Here,toobtainpopulationμandσ,inadditiontoourTreatmentandControldata,wealsoincludeyear-longTwitterdataofover240MTwitterposts(September2018toAugust2019).Foreachofthemeasuresinsymptomaticandsupport-seekingexpressions,wecalculatethez-scoreperdayandinterpretpositivez-scoresasvaluesabovethemean,andnegativez-scoresasthosebelowthemean.

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Linguistic Differences ToexamineCOVID-19relatedlinguisticdifferencesinthepsychosocialexpressionsonsocialmedia,weemployanunsupervisedlanguagemodelingtechnique,theSparseAdditiveGenerativeModel(SAGE)[58].Givenanytwodatasets,SAGEselectssalientkeywordsbycomparingtheparametersoftwologisticallyparameterized-multinomialmodelsusingaself-tunedregularizationparametertocontrolthetradeoffbetweenfrequentandrarekeywords.WeconductSAGEtoidentifydistinguishingn-grams(n=1,2,3)betweentheTreatmentandControldatasets,wheretheSAGEmagnitudeofann-gramsignalsthedegreeofits“uniqueness”orsaliency.SAGEallowsustoobtainhowtheexpressionsdifferduringtheCOVID-19outbreakascomparedtotheControlperiod.WeconducttwoSAGEanalyses,oneeachforsymptomaticexpressionsandsupport-seekingexpressions.Forthesymptomaticexpressions,wefirstobtainpoststhatareindicativeofeitherofanxiety,depression,stress,orsuicidalideationinTreatmentandControl,andobtainSAGEforthetwodatasets.Wedosimilarforsupport-seekingexpressionsbyobtainingpoststhatareindicativeofeitheremotionalorinformationalsupport.

Finally,wecross-examinethesalientkeywordsacrosssymptomaticandsupport-seekingexpressions,tostudyhowconcernsareprevalentineitherorbothofthekindsofexpressions.Wemeasurelog-likelihoodratios(LLR)alongwithadd-1smoothing,whereLLRcloseto0indicatescomparablefrequencies,LLR<1indicatesthegreaterfrequencyinsymptomaticexpressionsandLLR>1indicatesthegreaterfrequencyinsupport-seekingexpressions.Togethertheselinguisticanalysesenableustoobtainpsychologicalconcerns,andunderstandhowCOVID-19haspsychosociallyaffectedindividuals,andtocontextualizetheseconcernsintheliteratureonconsequencesofglobalcrises.

Results WesummarizeourfirstsetofresultsinTable1.Forallourmeasures,wefindstatisticalsignificance(aspert-tests)insocialmediaexpressionsintheTreatmentdataascomparedtothatinControl.Assumingthatmostotherconfounderswereminimizedduetothegeo-temporalsimilarityofthedatasets,ourfindingsindicatethattheCOVID-19outbreakledtoanincreaseinpeople’ssymptomaticandsupportexpressionsofmentalhealth.Weelaborateontheresultsbelow.

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Table1.ComparingsocialmediaexpressionsinTreatment(2020)andControl(2019)(*p<0.05,**p<0.01,***p<0.001). Treatment(2020) Control(2019) Expression Mean Stdev. Mean Stdev. Δ% t-stat.

SymptomaticMentalHealthExpressionsAnxiety 1.65 0.20 1.35 0.08 21.32 12.31***Depression 9.00 0.60 8.17 0.35 10.18 10.56***Stress 19.31 0.77 18.61 0.43 3.76 3.05**SuicidalIdeation 3.14 0..31 2.62 0.13 19.73 13.46***

SupportExpressionsEmotionalSupport 8.56 0.84 8.17 0.50 4.77 2.85**InformationalSupport 1.75 0.18 1.67 0.08 4.78 3.50***

Temporal Variation Figure1showsthechangesinsymptomaticmentalhealthexpressionsforthesameperiodinTreatment(2020)andControl(2019)years.WefindthattheTreatmentandControlshowsignificantdifferencesinthepeople’ssymptomaticexpressions(Table1),amongwhich,anxietyshowsthemostsignificantincrease(21.32%),followedbysuicidalideation(19.73%),depression(10.18%),andstress(3.76%).Figure2showstheevolutionofsupport-seekingexpressionschangeintheTreatmentandControldatasets.Likeabove,thedifferencesaresignificant(Table1),andwefindthatnotonlyemotionalsupportincreasesby4.77%,andinformationalsupportalsoincreasesby4.78%.

InboththeplotsofFigure1and2,wefindageneraltrendofnegativeslope(avg.slope=-0.03)withintheTreatmentyear,whichisclosertozeroslope(avg.slope=3.19*10−4)intheControldataset.ThismaysuggestthatwithintheTreatmentyear,people’smentalhealthexpressionsgraduallyleveledoutovertime,despitethegrowingrateofCOVID-19activecases.Theplotsindicatethatpsychologicalexpressionsalmostconvergeatthetails.Thiscouldlikelybeduetopeople’shabituationwiththesituationandsurroundingswiththepassageoftime[59],ashasbeenobservedforothercrisisevents[33,60];however,thisneedstobeexploredfurther.WithintheControldataset,weobserveasuddenpeakonApril28,2019,whichcouldbeattributedtoashootingincidentatasynagogueinSanDiego[61].TheobservationsreflectthattheCOVID-19pandemichasincreasedpeople’smentalhealthexpressionsonsocialmedia,aligningwithothercontemporaryliteratureandmediareports[8,38].

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Figure1.Comparisonofsymptomaticmentalhealthexpressionsonsocialmediapostsinthesameperiod(March24-May24)in2019and2020(COVID-19outbreakyear).

Figure2.Comparisonofsupportexpressionsonsocialmediapostsinthesameperiod(March24-May24)in2019and2020(COVID-19outbreakyear).

Linguistic Expressions Symptomatic Mental Health Expressions Table2summarizesthelanguagedifferencesasperSAGEforpostsexpressinghighmentalhealthexpressionsinTreatmentandControlperiods.AmajorityofthekeywordsthatoccurintheTreatmentperiodarecontextuallyrelatedtotheCOVID-19pandemic,suchascovid19,coronavirus,socialdistancing,stayathomeisolation.

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Thesekeywordsareusedinpostsexpressingmentalhealthconcernseitherexplicitly,e.g.,“Socialdistancingisbothsadandanxiety-inducingatthesamemoment”,orimplicitly,e.g.,“Inordertogetmyfamilytreated,Iwilldomorethanbeg,andIwilldonate25KforresearchtodevelopCOVID19vaccine.”WealsofindthattheTreatmentperioduseskeywordsreferringtokeypersonnelsuchasdrfauci(referringtoAnthonyFauci,oneoftheleadsintheincumbentWhiteHouseCoronavirusTaskForceintheU.S.andDirectoroftheNationalInstituteofAllergyandInfectiousDiseasessince1984[62])andpoliticalfigureslikeNuryMartinezandDonaldTrump.Further,wefindkeywords,suchasessentialworkers,doctorjobs,andriskinglives,whichdescribehigh-riskworkersituations,e.g.,“Iamnotcomplainingaboutgoingtowork,rather,Iamconcernedaboutriskingmyhealthforwork.”,andcertaintreatmentsuggestionsthatevolvedduringthisperiod[63]suchasgarlic,malaria,andhydroxychloroquine,e.g.,“Ihearamandiedafteringestingamalariadrug,thoughhetookaversionofthedrugusedforfishinfection”,and“Wouldeatingenoughgarlickeepmesafefromthesix-feetawaysocialdistancingthing?”

Table2.Topsalientn-grams(n=1.2,3)forsymptomaticmentalhealthconcernsinTreatmentandControldatasets(SAGEAnalysis[58]).

SalientinTreatment(2020) SalientinControl(2019)Keyword SAGEKeyword SAGE Keyword SAGEKeyword SAGEcovid19 11.17 flattenthecurve 7.44 hospitality -2.81 tournament -1.92lordmarvelous 10.87 doctorjobs 7.32 trainee -2.78 muslim -1.90coronavirus 10.58 garlic 7.29 crimes -2.74 florida -1.90socialdistancing 9.92 hydroxychloroquine 7.28 delay -2.55 boston -1.88nurymartinez 9.66 n95masks 7.26 traffic -2.55 cashier -1.87workingcouncilwoman 9.66 masksgloves 7.26 accident -2.39 playoffs -1.86

boreddaily 8.69practicesocialdistancing 7.21

financeaccounting -2.26

salesrepresentative -1.85

stayathomeisolation 8.69physicianjobsdoctorjobs 7.13 halffinance -2.22 springfield -1.84

quarantinelife 8.62 quarantinelife 6.98 auburn -2.21 border -1.84quarantinegot 7.87 plzhelpsmall 6.96 halftechnology -2.19 barista -1.77securityguard 7.63 smalldonation 6.96 pete -2.19 israel -1.77essentialworkers 7.62 stayhomeorders 6.92 parttime -2.18 ncclick -1.76drfauci 7.56 selfquarantine 6.88 roberthalf -2.12 playoff -1.75wenttired 7.48 positivecovid19 6.79 tickets -2.08 bracket -1.75coronaviruspandemic 7.44 riskinglives 6.79 marvel -2.07 terrorist -1.65

Support-Seeking Expressions Table3liststhetopkeywordsasperSAGEforsupport-seekingpostsinTreatmentandControlperiod.Likeabove,wefindkeywordsthatexplicitlyrelatetoCOVID-19occurintheTreatmentperiod.WealsofindthattheTreatmentperiodconsistsofpoststhatseeksupportrelatedtojobandpaysuchas,losingjobs,needpay,andfurloughed,e.g.,“Manyinourcommunityhavelosttheirjobs,areunderinsuredandarestrugglingtomakeendsmeet.Providingpantries,hotmeals,hotspotsanddistancelearningopportunitiesisnowmorecriticalthanever,pleasedonate.”Ourdataalsorevealstheprevalenceofcontextuallyrelatedkeywordssuchasmasks,ppe,hoarding,stockpile,andsanitizerthataremedicallyrecommendedprevention

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andcontainmentmeasuresofCOVID-19infection,e.g.,“PleasecontactmeifyouhaveanyN95maskorknowtoobtainsome.MysisterandafewfriendworkintheORandtheydonothavethesuppliestostaysafe,theyhavepatientswhohave#COVID19.TY!#HealthcareHeroes.”

Table3.Topsalientn-grams(n=1.2,3)forsupport-seekingexpressionsinTreatmentandControldatasets(SAGEAnalysis[58]).

SalientinTreatment(2020) SalientinControl(2019)Keyword SAGEKeyword SAGE Keyword SAGEKeyword SAGElord 7.93 staysafe 4.67 hospitality -2.86 cashier -1.79fauci 6.70 foodbills 4.66 duke -2.51 springfield -1.79ventilators 6.59 disinfectant 4.64 shiftsupervisor -2.24 delay -1.76quarantine 6.47 handsanitizer 3.08 tampa -2.21 baristastore -1.76securityofficer 6.11 clorox 3.03 advisor -1.95 boston -1.76n95 5.53 medicalsupplies 2.97 customerservice -1.92 counter -1.75hopestayingsafe 5.36 tryingtimes 2.89 investigation -1.89 barista -1.74ppe 5.25 riskinglives 2.87 managerretail -1.87 columbia -1.73wearingmasks 5.20 stockpile 2.86 traffic -1.87 meetingretail -1.73

uncertaintimes 5.16 fatherpassed 2.36 muslim -1.86informationalmeeting -1.73

healthcareworkers 5.01 hoarding 2.31 storemanager -1.85 stlouis -1.72furloughed 5.00 mask 2.31 tickets -1.85 marvel -1.70

asymptomatic 4.95medicalprofessionals 2.27 playoffs -1.83 marketing -1.68

peoplequarantine 4.90 losingjobs 2.27 cubs -1.82 server -1.67fightingstigma 4.82 toiletpaper 2.05 border -1.81 accident -1.64

Linguistic Comparability Finally,Table4showstheresultsofthelexicalcomparabilityanalysis,wherelog-likelihoodratios(LLRs)demarcatethetopkeywordsusedforsymptomaticmentalhealthexpressionsandsupport-seekingexpressionswithintheTreatmentdataset.Wefindthatkeywords,suchassafetyprecautions(wearmasks),healthcareandtreatment(healthcareworkers,hospitalized,beds,andicu),andlife/death(passedaway,killpeople,humanlives,anddeaths)comparablyoverlapinbothkindsofpsychologicalexpressions(LLR~0).Thesekeywordsarealsousedtoraiseawarenessandexpresssolidaritywithhealthcareandhigh-riskworkers,e.g.,“Takingallsafetyprecautionsandadheringtotheguidelinesestablishedbyourhealthcareprofessionalswillkeepussafe.”Ourlexico-psychologicalanalysesrevealthatmoreclinicallyrelevantkeywordsandsymptomsoccurfrequentlyinsymptomaticexpressions(LLR>0),e.g.,sleepscheduleandtestedpositive,whereas,sociallyrelevantandstressfulcircumstancesaremoreprevalentinsupport-seekingexpressions(LLR<0),e.g.,imsingleparent,starve,andlostjobs.

Table4.DistributionofsocialmediakeywordsacrosshighsymptomaticmentalhealthandsupportseekingexpressionswithinTreatmentperiodusingLog-

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likelihoodRatios(LLR).KeywordswithLLR>0distinctlyoccurinhighsymptomaticexpressions,thosewith<0distinctlyoccurinsupport-seekingexpressions,andthose~0occurcomparablyinboth.

LLR>0 LLR~0 LLR<0Keyword LLR Keyword LLR Keyword LLR

sleepschedule 0.75 infected -0.01 imsingleparent -1lonely 0.64 wearmasks -0.01 starve -1anxiety 0.62 needhelp -0.01 meditate -1isolation 0.56 killpeople -0.01 sorryloss -0.73staysafe 0.56 needpay 0 carepeople -0.7bored 0.56 healthcareworkers 0 hardtimes -0.45testedpositive 0.52 passedaway 0 peoplesick -0.4quarantinelife 0.52 seriousness 0 helpingpeople -0.4homeschooling 0.51 humanlives 0 sorryhear -0.39tired 0.5 deaths 0 urged -0.33doctor 0.48 domesticviolence 0 newyorkers -0.29fightingstigma 0.46 comforting 0 lostjobs -0.21depression 0.45 hospitalized 0 hopefamily -0.21stuckinside 0.42 beds 0 selfish -0.21sane 0.41 icu 0.01 desperate -0.21

Discussion

Principal Results OurstudysuggeststhatsocialmediapostsduringtheCOVID-19pandemiccontainasignificantlyhigherfrequencyofsymptomaticmentalhealthandsupport-seekingexpressionsthanacomparabledatasetfromthesameperiodinthepreviousyear.Wealsofindthattheytopicallyrelatetotheongoingcrisissituation,andincludeconcernssuchas:treatment,precautionarymeasures,lossofjobs,schoolclosings,stockpilingofbasiclivelihoodnecessities,feelinglonely,bored,andtiredoftherestrictionsandconstraintsputonbytheongoingpandemic,andsoon.OurfindingssuggestthatalthoughtheCOVID-19pandemichasamplifiedmentalhealthrisksandconcerns,itmayhaveheightenedasenseofbelongingandsolidarityamongindividuals—bringingthemtogether,raisingcollectiveawareness,andencouragingthemtoprovidesupporttooneanother.Forexample,manypeoplehavebeenconsiderateabouthealthcareandessentialworkersperforminghigh-riskjobs(Instacartdeliveryworkers,Amazonwarehouseemployees,Uberdrivers),andhaveexpresseddesireandsetupopportunitiesfordonatingtothosewhohavelostjobsduringthecrisis.Mediareportshavealsoindicatedhowbenevolentneighborshavebeentendingtotheirelderlyneighborsbydeliveringtheirgroceriesandotherbasicnecessities[64].

However,mentalhealthexpertssaythatwhilethecrisisisamplifyingriskfactorsforsuicide,thecoronavirusoutbreak’seffectonindividuals’mentalandemotionalwellbeingiscomplex[65].Suicideismultifaceted,andwhileeconomiclossisariskfactor,soaredepression,isolationandfearofthefuture.Atthesametime,thecrisisispossiblycreatingasenseofbelongingforindividualsatriskforsuicideasstress

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andanxietyarenormalized,andpeoplecometogethertobettersupportoneanotherduringacrisis[66,67].AsFloridanotedinarecentarticle[68]:“Thelong-termtollonmentalhealthofsocialisolation,remotework,andeconomicinsecuritycouldhaveimpactsakintopost-traumaticstressdisorder;yet,thenewfocusonmentalhealthmayreducestigmaandincreasetheavailabilityofsupportservices.”Indeed,theworldbeyondthecrisismaybeoneinwhichmentalhealthismorehonestlyrecognizedandsupported.

Interestingly,wenotethatourfindingsindicateagraduallevelingoutoftheseexpressions—bothsymptomaticandsupportive,mayreflectadeveloping‘newnormal.’InFebruary2020,itseemedunthinkablethewhite-collarworkforceofmanycountrieswouldsoonbeworkingsolelyfromhome,itseemedunthinkableairtravelwouldplummetby96%,andallmajorsportingeventswillbecalledoff.WhiletheearlydaysofCOVID-19weretaintedwithfeelingsofshock,despair,andasenseoflackofcontrol,asshowninourdata,overtime,manyareslowlyadaptingtoanewwayoflifeandcomingtotermswiththerealitythatthepandemicisnotonlyheretostayforawhile,butmightleadtoanewworldorder.Indeed,epidemiologistssurmisethatmanyifnotmostchangessurroundingtherhythmsofourdailylifearelikelytofadeovertime,justastheydidafterthe1918influenzaepidemic[68].Inotherwords,thepandemicwouldmakeusrevisitandpossiblyreformmanyofourlifestylechoicesandcivicroles,andthepersistentdiscussionofthe‘newnormal’mayhelpbringordertoourcurrentturbulence.Othershavearguedthatperhapsthecrisisisanpreludetoa‘newparadigm,’asrecentlynotedbytheWorldEconomicForum[69]:“Feelingunsettled,destabilizedandalonecanhelpusempathizewithindividualswhohavefacedsystematicexclusionslong-ignoredbysocietyevenbeforetheriseofCOVID-19–thusstimulatingurgentactiontoimprovetheircondition.”Weshouldtherefore“revelinthediscomfortofthecurrentmomenttogeneratea‘newparadigm,’nota‘newnormal.’Thelevelingouttrendinourdatagivesempiricalgroundtotheseconjectures.

Nevertheless,ifrobustanti-viraltreatmentsaredevelopedandrolledoutrelativelyquicklyand/orifavaccinebecomesavailablesoonenough,presumably,thechangeswillbeshort-lived,andthenewnormalmaybetemporary.Butifthepandemiccomesbackinlargerwavesoverthenextfewseasons,likewasthecasewithhistoricalepidemics,theeconomic,political,andsocialcrisesthathavearisenasaconsequencewillleadtodeeperramificationsinturnleadingtolonger-lastingorpermanentchanges.Futureresearchwillneedtoexplorethepersistenceofthenewnormalandtheemergenceofapossiblenewparadigmasthepandemicevolves,andthereinthementalhealthimpactsfurtheralonginthecrisis.

Comparison with Prior Work COVID-19isnotthefirstpandemic—catastrophicpandemicshavebeenoccurringatregularintervalsthroughouthumanhistory,withthe1918influenzaepidemicbeingthelastonebeforethecurrentpandemic[70].Thebackdropofthe1918pandemicwasthatithappenedjustbeforetheadventofmodernpsychiatryasascienceandaclinicalspecialty–atimewhenpsychoanalysiswasgaining

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recognitionasanestablishedtreatmentwithinthemedicalcommunity[71,72].Consequently,psychiatryhashadlittleopportunitytoconsidersuchhistoricallyimportantphenomenathroughitsclinical,scientificlens,untilnow.AlthoughoutbreaksoftheZikaandEbolavirus,MERS,andSARSmanagedtodrawglobalattention,stirringupanxietyanduncertaintyinsocieties,scholarshavenotedthatparticipationofmentalhealthexpertsinpandemicpreparednesshasremainednegligible[73].Consequently,ourabilitytounderstandmentalhealthresponsesaswellasthementalhealthburdeninpandemicoutbreakshavebeenlimited[74].Forinstance,aroutinelypracticedmethodofinfectioncontrol,quarantineandsocialdistancinghavereceivedsurprisinglylittleattentioninpsychiatricliteraturesofar.BaumeisterandLeary(1995)[75]contendedthathumansneedfrequentcontacts,andcrisiseventsfurtherstimulateaneedforaffiliationandintimacy.Therefore,prolongedisolationandseparationfromfamiliesandtheircommunitycanhaveprofoundeffectsonindividualseveniftheyarenotdirectlyaffectedbythedisease[4].Inthecurrentpandemic,theadditionallayerofextensiveuseofsocialmediaandexposuretooftensensationalizedonlinenews,whileinphysicalisolation,mayaddnewcomplexitiestoimplementingemotionalepidemiologyinmanagingconcerns,fears,andmisconceptions[76],asthesetoolshavebeenarguedtobearnegativeeffectsonpsychologicalwellbeing[77,78].

Byadoptingsocialmediaasalenstounpackthesepreviouslylessunderstooddimensionsofapandemic’smentalhealtheffects,ourworkisonesteptowardsclosingsomeoftheabove-notedgaps.ThepublishedliteraturepositsthatthedistressandanxietyamongindividualsinthisCOVID-19pandemicmayincreasetheincidenceofmentaldisorders[38,39,79];datathusfarfromtheU.S.pointtoapopulationincreaseinpsychologicaldistressof10%comparedto2018data[8],atrendwhichisinlinewithourpresentresults.TheseratesmaybehigherinthoseregionsheavilyexposedtoCOVID-19oramongindividualsworkingduringthepandemic,witharecentreviewreportingover20%prevalenceofanxiety,alsoconsistentwithourfindings[8].

PriorworkfoundthatmentalhealthdiscourseonTwitterrangesacrossstigmatizing,inspirational,resource,medical,andsocialdimensionsofexpressions[80],andourstudyrevealedsimilartopicaldiversityinourdataset.Further,wedetectedthroughsocialmediamanyofthestressesassociatedwiththepandemic–e.g.,prolongedisolation,exposuretopandemic-relateddeath,lossofincome/career,increasedworkload,andlackofpertinentandaccurateinformation.TheseresultsalignwithepidemiologicalfindingsthatCOVID-19hasledelevatedmentalhealthsymptomsforindividuals:Nelsonetal.(2020)surveyedtwothousandindividualsfromU.S.,Canada,andEuropeandfoundelevatedsymptomsofanxietyanddepressioncomparedtohistoricalnorms,andobservedfactorssimilartotheconcernswedetectedregardingsymptomaticexpressionsandthoserelatedtoseekingsupport.TheyalsoreinforcethesummarydatareleasedbytheCrisisTextLine(amajorcrisishelplineintheU.S.)listingmajorconcernsofcrisissupportsoughtduringthisperiod[81]—80%conversationsmentioning“virus”,34%mentioning“anxiety”,34%feelingsolidaritywithfriendsandfamily,etc.Along

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similarlines,therehavebeennumerousreportsabouttheincreasingnumberofmentalhealthcrisishelplinecallsduringthisperiod[82,83],providingfurthersupportandexternalvalidationthatoursocialmediafindingsreflectmanyofthesameelementsofdistressexpressedofflineduringthiscrisis.

Next,ourtemporalanalysespointedtoasteadydeclineinpeople’sexpressedpsychosocialconcernsduringthetwomonthstudyperiod(Figure1&2),whichconformswithsimilarfindingsinGooglesearchqueriesasstay-at-homeordersandotherCOVID-19relatedpolicychangeswereimplementedintheU.S.[84].WenotecontemporarysocialcomputingresearchstudyingvariousaspectsofthesocialmediadiscourserelatedtoCOVID-19[48,85,86].ByprovidingcomplementaryevidencetoobservationsbyMackeyetal.[85]andStokesetal.[86]onexpressed(mentalhealth)concernsduringthecrisis,ourworkfurtherunderscorestheirfindingsusingacomparable(control)dataset,reinforcingandprovidingempiricalcredibilitytotheimpressionthattheCOVID-19pandemichasindeedcausedorcontributeddirectlytothementalhealthconcernsthatwedescribe.

Limitations Wenotesomelimitationsinourwork,manyofwhichpresentexcellentdirectionsforfutureresearch.WerecognizethelackoftransparencyrelatedtotheTwitterstreamingAPI.Recentresearchhasalsoquestionedthecredibilityofthe“1%Twitterstream”aspectnotingthatactualsamplingdataissmallerthanwhatitideallyshouldhavebeen[56].Giventhesedatalimitations,wedecidedagainstconductingseveraldescriptiveandfine-grainedanalyses(suchascomparingregions),andrefrainedfrommakingclaimsbasedoncomparingabsolutenumbersofthoseimpactedbyvariousmentalhealthconcerns.Forexample,wecannotdefinebasedonourdata,whethertherewereincreasedordecreasedTwitterpostingsduringourCOVID-19studyperiodcomparedtothesamemonthsin2019.Besides,socialmediadatainherentlysuffersfrombiasesofself-selectionandrepresentation[87],andasarecentarticlebyChunaraandCook(2020)highlights,publichealthsurveillance(includingthatforCOVID-19)canaccountforseveralfactorssuchasthe“populationatrisk”inepidemiologyanddemographicdisparitiesintheuseandbehavioralexpressionsonsocialmedia[25].

Further,whilewedidhavedatabeyondMay24,2020,wedecidedtoexcludethoseinordertokeepourfocusontheeffectsonsocialmediaexpressionsduetoCOVID-19andminimizethosethatfollowedthedeathofGeorgeFloydonMay25,2020,inthelightoftheBlackLivesMatterproteststhroughouttheU.S.[88].Wealsoareawarethat,withthecontinuingnatureofthepandemic,ourconclusionsarerestrictedtothementalhealthandsupport-seekingconcernsexpressedduringafinitestudyperiod.Eventssincetheendofthestudyperiodunderscorethedynamicnatureoftheseevents,asdifferentpartsoftheU.S.areheavilyaffected,whileothersarerecoveringandsomeremainrelativelyspared.Itwillbeimportanttoextendthisworktemporarily,increasethesizeoffuturesamples,and,wheneverpossible,addgeospatialspecificitytofutureanalyses.Thelatterwillbeespeciallyimportantforpotentialsupportiveinterventionslocally,ifonehastheresourcesandtheabilityto

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assemblerecurring,near-real-timelocal“snapshots”asabasisforcommunityfocusedpreventiveinterventions.

Conclusion Ourwork,likethoseofothersstudyingothermajorevents,furtherreinforcesthepotentialutilityofaccessingandanalyzingsocialmediadatainnear-real-timeto‘takethetemperature’ofcommunities.Thiswillrequireamorefocusedandrobustcollectionoflocallytargetedinformationtobuildsamplesthataresufficientlylargetoproducereliablyrepresentativedatasetstobeusefulforpublichealthinterventions.Furtherworkisnowneededtotrackmentalhealth-relatedexpressionsandthosereflectingneedsforsupportthroughoutthepandemic,whichhasseendynamicchangesassociatedwithdiseasespreadtoareasthathadbeenlessaffectedduringtheearlymonthsoftheoutbreak.ThisgeospecificresearchmayfurtherenhanceourunderstandingofthecausalconnectionsbetweenCOVID-spreadandwavesofexpresseddistressed.Havingtheabilitytopresentlocallypertinent,contemporaneousanalysesofferstheopportunityforlocalpublichealthandmentalhealthproviders,aswellaspoliticalleaders,todevelopanddeploytargetedsupportservicesinatimelyfashion.

Acknowledgments MDCwaspartlysupportedbyaCOVID-19relatedRapidResponseResearch(RAPID)grant#2027689fromtheNationalScienceFoundation.

Conflicts of Interest JTreceivesunrelatedresearchsupportfromOtsuka.

Abbreviations COVID-19:CoronavirusDisease2019API:ApplicationProgrammingInterface

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