The Hottest Number in Silicon Valley, Explained

Jan. 15 (Bloomberg) -- Robin Dunbar, professor of evolutionary psychology at Oxford University, discusses "The Dunbar Number" or the true number of friendships you can handle in your life in relation to social networking. He speaks on Bloomberg Television's "Bloomberg Surveillance."

Bloomberg Best: Global Week in Review (02/12)
04:27 - A review of the week's top business stories from the U.S., Europe and Asia, including Federal Reserve Chair Janet Yellen's testimony before Congress, drama for Deutsche Bank and exclusive interviews with prominent business and political figures. (Source: Bloomberg)
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