Dunbar’s Number: 150

British anthropologist Robin Dunbar believes that humans can only maintain about 150 relationships due to the constraints of neocortex size. To be precise, he actually reached the number 148, but rounded it – and the statistical margin of error on his research means the true value could lie anywhere between 100 and 230.

As the size of many people’s social networks on Facebook, Orkut and other tools expand well beyond 150 are we sacrificing quality for quantity?

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