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You're talking about Dunbar's Number: http://en.wikipedia.org/wiki/Dunbar%27s_number

"Dunbar's number is a suggested cognitive limit to the number of people with whom one can maintain stable social relationships. These are relationships in which an individual knows who each person is, and how each person relates to every other person.[1] Proponents assert that numbers larger than this generally require more restrictive rules, laws, and enforced norms to maintain a stable, cohesive group. No precise value has been proposed for Dunbar's number. It has been proposed to lie between 100 and 230, with a commonly used value of 150."




That's also how Path came up the their maximum number of friends you can add: http://service.path.com/customer/portal/articles/659426-why-...

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Thanks for the link, made for interesting reading :)

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