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"The number has been validated across hunter-gatherer band sizes, military units, Hutterite communities, Christmas-card lists, telephone-calling networks, Facebook friend-graphs, and online gaming clans (Dunbar's 2020 and 2023 reviews; though contested by a 2021 Stockholm group, the original finding has held up across most subsequent replications)."
From # A Comprehensive Map of Marshall McLuhan's Thought: Concepts, Neuroscience, Unexplored Territory, and Critical Reception
Supports Neutral fact · Dunbar's number has been validated across hunter-gatherer band sizes, military units, Hutterite communities, Christmas-card lists, telephone-calling networks, Facebook friend-graphs, and online gaming clans
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