I haven't actually gone through the math, but my gut tells me the amount of human moderation that would make people happy, basically having a human look at ever

I haven't actually gone through the math, but my gut tells me the amount of human moderation that would make people happy, basically having a human look at every potentially bad post, is so high that Facebook wouldn't be profitable. The only company that's solved moderation at scale is Reddit. It punted the problem to unpaid moderators, so Reddit only needs to moderate the existence of subreddits, not posts.