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Three years ago, Facebook chief executive Mark Zuckerberg stridently defended the rights of Holocaust deniers to publish their thoughts on Facebook’s platform, saying Facebook wasn’t in the business of removing content just because its factually wrong. The reversal of that stance on Monday is a striking reminder of how Facebook is belatedly caving to criticism that the company has not done enough to prevent hate from spreading on its platform and has been slow to acknowledge the connections between misleading information, strategic disinformation, and violent acts.