Dunbar's Number
The hypothesis links primate social network size with cognitive demands of relationships.
The Mechanism: Robin Dunbar proposed a relationship between primate brain size and the number of stable social relationships a group could maintain. A figure near 150 became widely cited, but estimates vary and the hypothesis is debated.
The Philosophical Pivot: A number can help describe average patterns while misleading people into treating social capacity as a hard biological ceiling. Relationships differ in closeness, context, culture, and the effort invested in maintaining them.
The Horizon: Digital tools can expand contact lists, but a larger network does not automatically create deeper connection. The distinction between being reachable and being known remains important.
The theory should not be used to decide how many friends a person can or should have. Population estimates do not define an individual's social life.
A boundary that helps us think about groups can become restrictive when we mistake it for a rule about every person.
An average can describe a population while saying very little about the shape of one life.
Which relationships do I actually maintain, and what would change if I treated connection as quality rather than a count?