6:56 PM
Jalal Hameed
[ via Business Insider ] 20 Dec
The average happiness of English-speaking Twitter users peaked in April 2009 and has been on a downward slide ever since then.
The decline has gotten faster in the second half of 2011.
That's according to researchers at the University of Vermont who analyzed tweets from more than 60 million users over the last three years.
Read more: Business Insider
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