How Many Friends Do You Really Need?

The Brian Lehrer Show | Jan 6, 2011

Many people have hundreds, if not thousands of 'friends' on social networks like Facebook. But do they all really count? Robin Dunbar, director of the Institute of Cognitive and Evolutionary Anthropology at the University of Oxford and author of How Many Friends Does One Person Need?, discusses the theory of Dunbar's Number, which states that the maximum number of stable relationships one person can have is 150.

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