'Dunbar's number' suggests you can't have more than 150 friends, but could your brain really limit your social capacity?
An anthropologist named Robin Dunbar proposed in the early 1990s that we can only really have about 150 healthy relationships at once after studying other primate species socializing. This proposition, which came to be known as “Dunbar’s number”, is based on the limits of the human brain’s neocortex, and suggests that the human brain's structure sets a limit on our social lives.
Stockholm University researchers repeated Dunbar's analyses using modern statistical methods and updated data on primate brains. The results were much different.
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