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America Online (AOL) laumches America Online Instant Messenger (AIM).
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Friendster goes live to the U.S. public, grows to 3 million users in three months.
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LinkedIn is launched as a professioinal networking site by Reid Hoffman, Allen Blue, Konstantin Guericke, Eric Ly and Jean-Luc Vaillant. Reaches 4,500 members in the first month.
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Myspace allowed users to customize their profiles and rank their friends.
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Facebook starts at Havard College by Mark Zuckerberg. Myspace surpasses Friendster in page views.
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There are now 550 million people on Facebook, 65 million tweets are sent per day and there are 2 billion Youtube views per day.
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74% of online adults use a social networking site.