NearfolkDunbar's number: how many friends can you really keep?
Dunbar's number is the idea, from anthropologist Robin Dunbar, that people can maintain about 150 meaningful relationships, arranged in layers of roughly 5, 15, 50 and 150. It is an estimate, not a law, but it explains why close friendships need time and why a long list of contacts is not a circle.
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What is Dunbar's number?
Dunbar's number is a suggested limit on the number of people with whom one can maintain stable social relationships. Robin Dunbar, a British anthropologist, proposed it in the 1990s after observing a link between primate brain size and group size. For humans the figure he gave was about 150 (Wikipedia: Dunbar's number).
The number has been debated. Critics point out that the original estimate rests on correlations with a small set of primates and that real networks vary widely between people and cultures. Treat it as a useful rule of thumb about limited social attention, not as a measurement of any one person.
What are the layers?
Dunbar describes the circle as a set of nested layers, each roughly three times larger than the one inside it. The innermost layer holds a handful of people you turn to in crisis. Further out, closeness and contact frequency decrease.
The layers help because they make clear that no one is close to 150 people. A few people carry most of the emotional weight, and the rest take far less time.
| Layer | Approximate size | Typical contact | What it feels like |
|---|---|---|---|
| Support clique | About 5 | Weekly or more | People you call in a crisis |
| Sympathy group | About 15 | Every few weeks | Close friends and family |
| Affinity group | About 50 | A few times a year | Good friends you would invite to a party |
| Casual friends | About 150 | Yearly or less | People you would stop and chat with |
Does contact frequency really matter?
Yes, according to Dunbar's own research. In a study of how people maintain relationships over 18 months, Roberts and Dunbar (2011) found that friendships weakened more than family ties when people stopped seeing and talking to each other. Family closeness held up better without contact, while friendship needed regular maintenance. The same pattern is described in Nearfolk's article on why friendships fade.
This is the practical lesson from the numbers: friendship is a time budget. You cannot keep 50 people in your inner layers, because there are not enough hours.
What are the criticisms of the number?
Several researchers have questioned whether a single number applies to everyone. Studies using different data have produced a wide range of estimates, and the original primate comparison has been challenged. Personality also matters: people who enjoy large gatherings often keep wider networks than people who prefer one-to-one contact.
A sensible reading takes the shape and ignores the exact figure. The shape says that attention is finite, closeness comes in layers, and the inner layers need the most time. Whether your outer ring has 100 or 200 people changes little about how to live.
What should I do with my own friend list?
Take an inventory. Write the names of people you would call in a crisis, the ones you would invite to dinner, and the ones you would be glad to hear from. You may find that the inner layers are smaller than you want and that you spend most of your attention on the outer ones.
Then decide where to invest. If your inner circle is thin, spend more time on the people closest to it. If it is full, be gentle about the ones who sit outside it. It is not unkind to accept that you cannot be close to everyone.
- List everyone you consider a friend, in any order.
- Mark the five you would call first in a crisis.
- Mark the next ten or so you truly enjoy.
- Note who is missing that you wish were closer.
- Choose how often you want to be in touch with each layer.
How does an app fit into this?
A tool can support the layers if it respects them. Nearfolk lets you give each person a rhythm: about weekly, every two weeks, monthly, every three months or twice a year. That is the same idea as layers, applied to contact. Inner friends get tighter rhythms and outer friends get looser ones. The orbit shows each person as Near, Drifting or Far relative to their own rhythm, so a friend you see twice a year is not shown as neglected after three months.
Free keeps up to 10 people, which is a useful size for your inner layers, and Plus removes the limit. Today's three keeps the daily list to three at most.
Does social media change the number?
Online contacts can make a list look huge, but research on social networks suggests that the number of people you actually talk to stays modest. A feed lets you see updates from many people, which is lighter than a conversation. It may help you keep a weak tie warm, but it rarely moves someone into your inner layers.
A rule of thumb: if you have not exchanged a real message in a year, the person is on your list of contacts, not your list of friends. There is nothing wrong with that. It simply helps to know which is which.
A yearly friendship review
Once a year, sit down for twenty minutes and look at your layers. Ask who you miss, who gives you energy and who is slipping away. Move names between layers on purpose. Decide if any friend deserves a tighter rhythm, and if any contact can be loosened without guilt.
Share what you find with one close friend if you like. Saying 'I want to see you more often this year' is a gift, and it often prompts the same wish in return.
Are the layers fixed?
No. People move between layers as life changes. A colleague can become a close friend, and a close friend can drift to the outer circle after a move. Notice the movement and decide whether you want to follow it or change it.
Be careful not to read the model as a ranking of worth. The layers describe attention, which is finite, and not how much a person matters.
Frequently asked questions
What is Dunbar's number?
About 150, the suggested number of stable relationships a person can maintain, proposed by Robin Dunbar. It is an estimate and a topic of debate.
How many close friends can a person have?
Dunbar's layers suggest about 5 in the innermost circle and about 15 in the next. Individual numbers vary.
Is Dunbar's number accurate?
It is a useful guideline but not exact. Critics note that the evidence is limited and that networks differ between people.
Does Dunbar's number apply to social media?
Online lists can be larger, but the number of people you interact with closely stays small. Having many followers does not expand your inner circle.
How can I keep friendships within these limits?
Choose how often you want to be in touch with each layer, then use reminders or a tool that matches those rhythms.