Scientists have linked the number of Facebook friends a person has with the size of brain regions that have to do with memory, emotional responses, and social interaction. But don't go on a friending rampage just yet. It’s not clear whether having more Facebook friends changes those parts of the brain or whether those people are predisposed to have more friends. "The exciting question now is whether these structures change over time— this will help us answer the question of whether the Internet is changing our brains," said one of the researchers. The students in the study had an average of 300 friends, with the most connected users having up to 1,000.