Dunbar Number

• 邓巴数

生物学家Dunbar在1992年提出了一个名为Dunbar Number的理论：灵长类动物的大脑容量与它的族群大小有关，然后推论出一些人类大脑能够维持的关系数量，例如typical person would have

5 intimate friends
15 trusted friends
35 close friends
150 casual friends

Dunbar’s Number

A measurement of the “cognitive limit to the number of individuals with whom 
    any one person can maintain stable relationships.

• The Circles of Friendship: https://kottke.org/21/06/the-circles-of-friendship