Facebook

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Facebook is a social networking site that allows users to create a personal profile for adding other users as friends and exchange messages. Businesses, organizations, and government agencies are also allowed to set up profiles and provide updates.[1]

Facebook was founded by a Harvard student named Mark Zuckerberg, who started the website as "thefacebook.com" in 2004.[2]

By April 2007, Zuckerberg started to allow programmers to build applications that could take advantage from Facebook's social graph. By 2015, Facebook had about 1.4 billion users and it was the 2nd most visited website according to Alexa Rank after Google.[3]