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Facebook is private (at least most posts are). So "broader society" will not be giving feedback.

YouTube is public, and has a dislike button... many "fringe" videos still have tons of likes because they are mostly viewed by people sharing the same opinions.

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Most posts spread to at least a 3rd degree. I can share an article, my friends see it and comment on it. Then their friends see that they commented on an article by showing it to their friends.

Also, don't forget the share button. That causes the degrees to reset and it goes from there.

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