Anthropologist Robin Dunbar proposed that humans can maintain only a limited number of stable social relationships, commonly cited as around 150. The figure, known as Dunbar's number, is debated, but the underlying idea is useful for anyone trying to build a professional network: attention is finite.
What Dunbar's number actually says
Dunbar's research linked the size of primate social groups to brain size, then extrapolated to humans. He described layers of relationships, from a handful of very close ties to larger circles of people you know less well.
| Layer (approximate) | Typical description | | --- | --- | | ~5 | Closest confidants | | ~15 | Good friends | | ~50 | Friends and close colleagues | | ~150 | People you maintain a meaningful relationship with |
These figures are approximations from a body of research, not fixed laws. Researchers disagree about how precisely they apply to individuals or to online life.
Why this matters for professional networking
A large connection count on a platform doesn't mean a large network in the sense Dunbar describes. Someone with 5,000 connections cannot maintain 5,000 relationships. Most of those connections are dormant.
That leads to a more useful question: not "how many people do I know?" but "how many of the relationships that matter to me are relevant to what I'm doing now?"
The discovery bottleneck
There are two limits at work:
- Maintenance capacity: how many relationships you can keep active
- Discovery capacity: how many potentially relevant people you can find and evaluate
Dunbar's number speaks to the first. The second is a separate constraint. Manual search means you can only review a limited number of profiles, and you judge each on limited information.
Implications for how you network
- Be selective about which ties you maintain. A small number of relevant, active relationships is more useful than a long list.
- Reassess periodically. Goals change, and the people who are relevant change with them.
- Spend discovery effort where it counts. Finding the right 10 people is more valuable than finding 100 loosely related ones.
Where AI-assisted discovery fits
If maintenance capacity is limited, the goal of discovery should be relevance, not volume. Omnitwine applies AI to the discovery step: it uses professional context from conversations to identify people who may be relevant, and it requires approval before a connection is made. The aim is to reduce the manual searching so that your limited relationship capacity goes to the right people. It does not expand how many relationships you can maintain.
Common misreadings of Dunbar's number
- "You can only know 150 people." The figure refers to stable, meaningful relationships, not everyone you've ever met.
- "It's a precise limit." Estimates vary, and individuals differ.
- "Online tools have removed the limit." Digital tools help you keep in touch, but the time and attention required for a real relationship haven't changed.
FAQ
Is Dunbar's number scientifically settled?
No. It's influential but contested, and later studies have questioned how precisely it applies to humans.
Does the number apply to LinkedIn connections?
Not directly. A connection is a low-cost link and doesn't necessarily reflect an active relationship.
How many professional relationships should I actively maintain?
It depends on your role and time. Many people find a few dozen active relationships manageable.