http://www.switched.com/2011/01/28/facebook-makes-us-all-sad-because-everyone-is-happy-but-us/
The January issue of Personality and Social Psychology Bulletin includes a study by a PhD student at Stanford who investigated a two-fold phenomenon. First of all, we hand-pick our Facebook statuses and pictures to make us into the best versions of ourselves. (Duh.) Second, looking at the similarly idealized spread of our friends' lives can make us depressed, simply because we tend to think that everyone is more happy than us.
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