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Not quite. Villages were coherent communities with common knowledge broadcast bubbles (churches and town criers in Europe). Now little of significance, relatively speaking, happens at village-CK level.
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Hard though to believe that’s our trajectory. Knowledge will always be power. Power is others knowing you know. Human nature.
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You can't ever be sure that someone knows X unless they tell you directly. Depending on definitions, you can't be sure they "know" X even if you tell them. May sound nitpicky, but really don't understand what you mean. "no public record for groups >2" Is technology enabling this?