22/10/2025
A new report highlights “Dunbar’s number” — the idea that humans can maintain close social connections with about 150 people.
British psychologist Robin Dunbar found a link between brain size and social group size across primates, and humans follow the same pattern. Within that 150:
* 5 are your closest friends,
* 10 more are in your inner circle,
* 35 are casual friends, and
* about 100 others you still recognize.
Even in the age of social media, our brains haven’t evolved to handle more deep connections.