Mark Zuckerberg says Meta's 'community notes' are inspired by Elon Musk's X. Here's how they work — and how they don't.

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• Mark Zuckerberg's plan to replace fact checkers with "community notes" is a familiar one.
• A similar system of community moderation is already in place on Elon Musk's X.
• On X, community notes let users add context to posts. Meta has said it seems to work well.

Mark Zuckerberg says Meta will use "community notes" to moderate content on its platforms like Facebook and Instagram ...