The Book Summaries

The Book Summaries

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The Book Summaries
The Dunbar Number Explained

The Dunbar Number Explained

from The Social Brain

Jun 11, 2025
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The Book Summaries
The Book Summaries
The Dunbar Number Explained
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Years ago we launched a Facebook group for 100 social-entrepreneur friends.
In the beginning it was magic—funding leads, job openings, rapid-fire answers to tough questions.

Then the group became too popular. Membership surged past 10 000 and the signal drowned in noise. Helpful threads gave way to self-promotion, lurkers outnumbered doers, and replies be…

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