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Is it possible they could have some proper crowd sourced moderation and users vote out content that people do not think is ok to be online? Bias would have to be handled carefully as getting a whole group of people to take things down would perhaps be too easy, but then you could have reputation scores for moderators. A lot of communities turn to their users for help with this kind of thing and I don't understand why Facebook should be any different and expect all abuse to be reported to them.