Facebook Application tells us how happy everyone is!
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“The idea, one that is generally accepted in social psychology, is that word choice can reveal a person’s mood. This is true in ordinary writing, these experts say, and even more so in writing like Facebook updates or the tweets of Twitter users, which ostensibly are attempts to describe what you are doing right now and how you feel.”
NOAM COHEN “Is It a Day to Be Happy? Check the Index”, October 12, 2009, page B3 of the New York edition