The siren call of social media can be hard to resist, especially when you're working on a difficult project, folding laundry, or doing, oh, anything less interesting than seeing what all your friends did over the weekend. And there's actually a legit reason for Facebook addiction (and Instagram insanity and Twitter mania): According to a new study from UCLA, when we need a mental break, that's our brains craving social interaction. (As for Managing Stress: 10 Ways to De-Stress Anytime, Anywhere.)