Sublime
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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
Campbell and Brickman coined the term “hedonic treadmill”
Scott Galloway • The Algebra of Wealth: A Simple Formula for Success

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,
Robin Dunbar • Friends: Understanding the Power of our Most Important Relationships
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
Professor Rory Wilson of Swansea University has researched the degree to which illness, hormones, nutrition and emotions affect the movements of both humans and cockroaches.