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Dunbar’s Number

Dunbar's number is a limit of social connections a person may effectively maintain:

Dunbar's number is a suggested cognitive limit to the number of people with whom one can maintain stable social relationships—relationships in which an individual knows who each person is and how each person relates to every other person.

Or simply:

The number of people you would not feel embarrassed about joining uninvited for a drink if you happened to bump into them in a bar.

Depending on the study and evaluation method, for humans it's considered to be somewhere between 100 and 250, with a commonly used average value of 150. The number is believed to be correlated to the volume of the neocortex.

Thanks to the development of speech homo sapiens bumped the Dunbar's number which is named to be an evolutionary advantage that allowed us to outperform other species.


Dunbar's number - Wikipedia