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My anecdotal evidence generally seems to support the idea that group sizes will usually plateau at a number lower than 150 participants. This comes from 20 years of doing facilitation both on and offline, running several software companies, and running various forums at America Online. In particular, many online communities provide good evidence fo... See more

Christopher Allen • The Dunbar Number as a Limit to Group Sizes

Dunbar is an anthropologist at the University College of London, who wrote a paper on Co-Evolution Of Neocortex Size, Group Size And Language In Humans where he hypothesizes: " ... there is a cognitive limit to the number of individuals with whom any one person can maintain stable relationships, that this limit is a direct function of relative neoc... See more

Christopher Allen • The Dunbar Number as a Limit to Group Sizes

Network size increased up to the age of about thirty, stabilised, and then began to decline again from the age of about sixty.

Robin Dunbar • Friends: Understanding the Power of our Most Important Relationships

Dr. Charles Zuker: The Biology of Taste Perception & Sugar Craving

hubermanlab.com

Essentially, as we increase group sizes beyond 80, to 150, 200, or even 350-500, we typically do so by breaking larger groups down into smaller ones, and continually reducing community sizes down to the point where they can be understood and managed by people -- and so efficiency reasserts itself.

Christopher Allen • The Dunbar Number as a Limit to Group Sizes

there was around a 40 per cent turnover in network membership (technically known as ‘churn’) over the eighteen months that we had been tracking them.

Robin Dunbar • Friends: Understanding the Power of our Most Important Relationships

frequency of defections on up to 10 per cent of interactions will have little or no effect on the average number of friends an individual will have; frequencies greater than 10 per cent will have a small effect on the overall number of friends, but will mainly reduce the number of strong and medium ties,