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Timeline: The Most Important Social-Media Events in History

The first e-mail was sent just over 40 years ago; we've come a long way, baby. But along with the highs (Twitter-enabled revolutions, Chatroulette), there have been a lot of lows (Kim Kardashian's tweets, Chatroulette). These are the moments that are worth remembering and, in some cases, cringing about. Plus: See our complete coverage of social media mavericks.

February 14, 2012

January 2012: Google+ hits the 90-million-user mark and—experts predict—is on track to reach 400 million users by the end of the year, which would make it half the size of Facebook.

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