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Defense: Knowledge Sharing and Yahoo Answers: Everyone Knows Something. L. A. Adamic, et al. Why study Knowledge Sharing?. It is a rising method of communication (YA, Wikipedia) It differs from the classic model of a few authoritative sources - PowerPoint PPT Presentation
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Defense: Knowledge Sharing and Yahoo Answers: Everyone
Knows Something
Defense: Knowledge Sharing and Yahoo Answers: Everyone
Knows SomethingL. A. Adamic, et al.
Why study Knowledge Sharing?Why study Knowledge Sharing?
It is a rising method of communication (YA, Wikipedia)
It differs from the classic model of a few authoritative sources
Current implementations differ from the traditional forum format
Opportunity to study interaction between people (always useful!)
It is a rising method of communication (YA, Wikipedia)
It differs from the classic model of a few authoritative sources
Current implementations differ from the traditional forum format
Opportunity to study interaction between people (always useful!)
…but is it social networking?…but is it social networking?
Yes! There are regular users
Often have reused identities Can become familiar with each other Form networks of those who ask and those who answer
Most importantly: It is real people communicating, sharing ideas, etc.
Yes! There are regular users
Often have reused identities Can become familiar with each other Form networks of those who ask and those who answer
Most importantly: It is real people communicating, sharing ideas, etc.
Why Yahoo! Answers?Why Yahoo! Answers?
The largest English language question-answer site
Broad audience Avoids bias of more specific purpose sites Covers many topics
Provides a non-standard social networking methodology Does not allow traditional forum style
The largest English language question-answer site
Broad audience Avoids bias of more specific purpose sites Covers many topics
Provides a non-standard social networking methodology Does not allow traditional forum style
Cluster AnalysisCluster Analysis
Classify question categories by Thread length Asker/replier overlap Content length
Classify question categories by Thread length Asker/replier overlap Content length
Cluster AnalysisCluster Analysis
Provides a clear breakdown of categories of questions
Directly acknowledges the issue of the content of the questions
A good starting point, raises further questions about the nature of YA Who is asking? Are they the same people asking in each category?
Provides a clear breakdown of categories of questions
Directly acknowledges the issue of the content of the questions
A good starting point, raises further questions about the nature of YA Who is asking? Are they the same people asking in each category?
Degree DistributionsDegree Distributions
Form graph by connecting users who ask to users who answer
Form graph by connecting users who ask to users who answer
Ego NetworksEgo Networks
Shows connectedness of neighbors In general, discussion topics are more
connected Larger strongly connected components
Factual answer topics are less connected People who ask, aren’t answering In fact, are less connected than a random graph
of this size
Shows connectedness of neighbors In general, discussion topics are more
connected Larger strongly connected components
Factual answer topics are less connected People who ask, aren’t answering In fact, are less connected than a random graph
of this size
Motif AnalysisMotif Analysis Provides a further sense of “who responds
to who” Further indicates differences between
categories
Provides a further sense of “who responds to who”
Further indicates differences between categories
Network Structure AnalysisNetwork Structure Analysis
Provides insight into the structure of the network How information flows in different categories
under the same umbrella format
Could tailor the design of similar sites to the nature of the topics Optimize sharing information of certain types
Provides insight into the structure of the network How information flows in different categories
under the same umbrella format
Could tailor the design of similar sites to the nature of the topics Optimize sharing information of certain types
Network Structure AnalysisNetwork Structure Analysis
Provides strong indicators of the nature of user interaction How is a given user going to use this service? Ex: Discussion based have most mutual edges,
perhaps better suited towards different model
Provides strong indicators of the nature of user interaction How is a given user going to use this service? Ex: Discussion based have most mutual edges,
perhaps better suited towards different model
ExpertiseExpertise
Analyzed 100 random selections from programming section
Rated 1-5 (1 basic, 5 “pro”) Found that only 1% was above a level 3
Analyzed 100 random selections from programming section
Rated 1-5 (1 basic, 5 “pro”) Found that only 1% was above a level 3
ExpertiseExpertise
Admittedly not a definitive sample! Still an important hint about nature of YA
The questions seem shallow because they likely are
The fact that much of the information may be trivial is unimportant Still an important topic to look into
Admittedly not a definitive sample! Still an important hint about nature of YA
The questions seem shallow because they likely are
The fact that much of the information may be trivial is unimportant Still an important topic to look into
User EntropyUser Entropy
Analyzed the distribution of answers from users across categories
Generally well spread out Some users are very focused, very low entropy But a high number have very high entropy, ask
and answer many questions
Analyzed the distribution of answers from users across categories
Generally well spread out Some users are very focused, very low entropy But a high number have very high entropy, ask
and answer many questions
Entropy AnalysisEntropy Analysis
Emphasizes the breadth of YA Many people are interested in many topics Suggests the strengths of having a general site
instead of something more tightly focused As pointed out, this may be at the sacrifice of depth
Again, helps to build a user profile Who is using this service? And for what?
Emphasizes the breadth of YA Many people are interested in many topics Suggests the strengths of having a general site
instead of something more tightly focused As pointed out, this may be at the sacrifice of depth
Again, helps to build a user profile Who is using this service? And for what?
Best AnswersBest Answers
YA allows the asker to pick a best answer, or other users to vote
Found: People seem to like longer answers No correlation between entropy across all
categories and overall percentage of best answers (but some for top-level categories looking for expertise)
Reply length, track record good indicators
YA allows the asker to pick a best answer, or other users to vote
Found: People seem to like longer answers No correlation between entropy across all
categories and overall percentage of best answers (but some for top-level categories looking for expertise)
Reply length, track record good indicators
Best AnswersBest Answers
Provides a sense of what other users take to be most insightful An important issue in Knowledge Sharing In categories where applicable, raises question
of correlation with the actual best answer
Another element not found in traditional forum
Provides a sense of what other users take to be most insightful An important issue in Knowledge Sharing In categories where applicable, raises question
of correlation with the actual best answer
Another element not found in traditional forum
Best AnswersBest Answers
Provides an analysis of the Best Answer in terms of the category type Compare to E. Agichtein, et al. Finding High-
Quality Content in Social Media, WDSM’08, 2008 which focuses on the answer quality
Provides an analysis of the Best Answer in terms of the category type Compare to E. Agichtein, et al. Finding High-
Quality Content in Social Media, WDSM’08, 2008 which focuses on the answer quality
So why was all this good?So why was all this good?
Provides a first look at diverse, large scale question-answer network Not attempting to delve into the intricacies of
Yahoo! Answers Acknowledges a number of issues that arise in
such a model (Breadth vs. Depth) High school homework problems
Provides a more well defined picture of structures and user interactions
Provides a first look at diverse, large scale question-answer network Not attempting to delve into the intricacies of
Yahoo! Answers Acknowledges a number of issues that arise in
such a model (Breadth vs. Depth) High school homework problems
Provides a more well defined picture of structures and user interactions