Researchers at the University of Vermont sifted through more than 10 million geotagged tweets from 2011 to map out the moods of Americans in urban areas.
A recent study revealed which states have the happiest and saddest Twitter users. Find out where the happiest and saddest states are, according to Twitter.
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Former Republican presidential nominee Mitt Romney appeared on "The Tonight Show" with Jay Leno on Friday and weighed in on the barrage of controversies plaguing the White House in recent weeks.
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