Size of Key Brain Region Linked to Size of Your Social Network, University of South Florida Finds  
12/29/2010 7:13:20 AM

MONDAY, Dec. 27 (HealthDay News) -- The size of your amygdala, an almond-shaped portion of the brain involved in emotions, may be as strong a marker for having rich and varied social relationships as how many "friends" you have on Facebook, researchers say.