This is your brain on Facebook

This study purports that the more friends you have on Facebook, the more developed the social bits of your brain are.

It says that brain areas for social skills are larger in "college students with sprawling social networks than in Facebook users with fewer friends." The authors caution that they're not making any sweeping cause and effect statement here. So basically the more friends you have, the more you'll have on Facebook. Duh.

The full study report is available online.