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Naval Academy study: Could Twitter predict presidential election?

What if the outcome of the presidential election could be predicted by collecting data from Twitter? Or what if posts on the social media site - which allows all users to send and read short text messages - could foresee volatility in the stock market? We're not there yet, but a Naval Academy professor and a group of midshipmen say they've taken a big step toward achieving such feats. The group created a computer system that can essentially learn to read the "mood of the nation" from more than half a billion posts from Twitter users. And that "mood," they found, very closely follows Gallup's Presidential Job Approval poll, which gauges voter...