There is a surprising amount of false information on Facebook. Some of it is advertising masquerading as social posts. Some of it is even political propaganda: For instance, during the election, a Facebook page that seemed to be from a hospital turned out to be an anti-Obamacare screed.

In the November 13th edition of the New York Times, Somini Sengupta writes: "The fake page came down 11 days later, as mysteriously as it had come up. The hospital says it has no clue who was behind it.
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Tweeting false information could put you in jail. During Superstorm Sandy, a Twitter user spread misinformation by tweeting that the New York Stock Exchange "is flooded under more than 3 feet of water" and New York Governor Andrew Cuomo "is trapped in Manhattan. Has been taken to a secure shelter."

The Supreme Court has held that such statements are imminently dangerous and not protected by the First Amendment.
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Most people join social networks like Facebook in order to MAKE friends, but in the process, they often end up LOSING them instead, because people tend to become surprisingly nasty to each other online, texting things they would never say to someone face to face.
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