Facebook is an online social networking service headquartered in Menlo Park, California. Its website was launched on February 4, 2004, by Mark Zuckerberg with his Harvard College roommates and fellow students Eduardo Saverin, Andrew McCollum, Dustin Moskovitz and Chris Hughes. After registering to use the site, users can create a user profile, add other users as “friends”, exchange messages, post status updates and photos, share videos and receive notifications when others update their profiles.
Additionally, users may join common-interest user groups, organized by workplace, school or college, or other characteristics and categorize their friends into lists such as “People From Work” or “Close Friends”. Facebook had over 1.44 billion monthly active users as of March 2015. Because of the large volume of data users submit to the service, Facebook has come under scrutiny for their privacy policies. On July 13, 2015, Facebook became the fastest company in the Standard & Poor’s 500 Index to reach a market cap of $250 billion.
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