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  • "Dunbar noticed that ape groups tended to top out at 55 members. Since human brains were proportionally bigger, Dunbar figured that our maximum number of social connections would be similarly larger: about 150 on average. Sure enough, psychological studies have confirmed that human groupings naturally tail off at around 150 people: the “Dunbar number,�? as it is known."

    The New York Times, Brave New World of Digital Intimacy, by Clive Thompson, September 5, 2008

    September 6, 2008


    From about the 10-minute mark on.

    November 1, 2011