According to NPR and the University of Michigan Facebook also contributes to unhappiness:
A new study on college-aged adults finds that the more they used Facebook, the worse they felt. The study, published in the journal PLOS One, found Facebook use led to declines in moment-to-moment happiness and overall life satisfaction.
"There's a huge amount of interest ... because Facebook is so widespread," says research co-author , a University of Michigan cognitive neuroscientist. "With something like half a billion people who use Facebook every day, understanding the consequences of that use on our well being is of critical importance."
http://www.npr.org/blogs/alltechconsidered...rce=mostemailedI do use Facebook, mainly to keep up with cousins and such who live far away, but I do note a dissatisfaction sometimes and I think it's that I'm not there in reality! It isn't a very good second choice!