BY: Satya BaralKIIT University,India.

Facebook is a social networking service and website launched inFebruary 2004. Facebook was founded by Mark Zuckerberg. A January 2009 Complete.com study ranked Facebook as the most used social networking service by worldwide monthly active users. Facebook launched a high-school version in September 2005. Facebook later expanded membership eligibility to employees of several companies, including Apple.inc. and Microsoft. Facebook was then opened on September 26, 2006, to everyone of age 13 and older with a valid email address. On October 24, 2007, Microsoft announced that it had purchased a 1.6% share of Facebook for$240 million, giving Facebook a total implied value of around$15 billion. In September 2009, Facebook said that it had turned cash-flow positive for the first time. In early 2011, Facebook announced plans to move to its new headquarters, the former Sun Microsystems campus in Menlo Park.California.

Dorsey introduced the idea of an individual

using an SMS service to communicate with a

small group. The original project code name for

the service was twttr. Work on the project

started on March 21,

2006, when Dorsey published the first

Twitter message. In October 2006, Biz Stone,

Evan Williums, Dorsey, and other members

of Odeo formed Obvious Corporation and

acquired Odeo

and all of its assets–including Odeo.com and

Twitter.com–from the investors and. In June

2008, Twitter launched a verification

program, allowing celebrities to get their

accounts verified. On September 7, 20011,

Twitter announces that it has

100 million active users logging in at least

once a month and 50 million active users

everyday.

Google+ is a social networking and identity service owned and operated by Google Inc. It is the second-largest social networking site in the world, having surpassed Twitter in January 2013. It has approximately 359 million active users.As of May 2013, it had a total of 500 million registered users, of whom 235 million are active in a given month. Google has described Google+ as a "social layer" that enhances many of its online properties, unlike conventional social networks generally accessed through a single website.

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