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Social media has grown up. News that breaks on Twitter is now news that moves the markets, sometimes even when it's not news.

( Read More: False Rumor of Explosion at White House Causes Stocks to Briefly Plunge )

Earlier this week, the AP's Twitter account was hacked and a fake tweet was posted about President Obama being injured in an explosion. The Dow dropped 143 points and $136.5 billion in value was shaved off the S&P for a brief period. While the market quickly rebounded, it was a wake up call for investors.

Here's a look at some tweets that affected trading.

By Cadie Thompson
Updated 25 April 2013

Fred Tanneau | AFP | Getty Images