http://phys.org/news/2015-11-happier-life-facebook.html

Saw this on Newsnight last night. Group of people gave it up for a week, group of people didn't - the first group were measurably happier than when they started.
Turns out we're always comparing our social interactions in relation to everyone elses, and when you stop you're happier.
Of course the sexybum's of the world without Facebook are already at maximum happiness, sorry.

Fancy giving it up?