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Take a glance at the Facebook groups or poke around prominent internet forums and you'll find plenty of rabid social networkers who want Facebook to lift their limitation of 5,000 friends.

But Robin Dunbar, professor of Evolutionary Anthropology at Oxford University, has revealed that human brains are only capable of managing a scant 150 friendships; a number that hasn't changed throughout history, despite our modern fascination with Twitter, blogging and Facebook.

Read the full article on Wired.com.