The math in behavioural science
Most studies show that natural human communities and personal social networks have a typical size of about 150.
- Survey data shows that the average wedding has 144 guests.
- Typical medieval English villages - 150 people.
- The average number of Facebook friends and email contacts are between 150 to 250.
- Most people have 5 friends they contact weekly, about 15 they talk to monthly, roughly 50 they hear from every six months, and 150 they connect with annually.
Friendships are fragile. If you don't take care of those relationships, they will disappear.
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