Dunbar’s Number

Dunbar’s Number, 150, describes the maximum amount of successful, stable, social relationships that one person can simultaneously maintain. The British evolutionary biologist, anthropologist and author of How Many Friends Does One Person Need?, Robin Dunbar, theorised that if a person exceeded this limit then one or more of their existing social connections will suffer and weaken as a consequence.

Malcolm Gladwell introduces Dunbar’s Number in the following passage taken from The Tipping Point.

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