There are really two issues here, both of which make it difficult for these sites to moderate their 'communities': 1. Moderation doesn't scale. It can't be aut

There are really two issues here, both of which make it difficult for these sites to moderate their 'communities': 1. Moderation doesn't scale. It can't be automated with an algorithm (well), it can't be done well by a bunch of low paid contractors with a handbook and it can't be done across a million user platform by about three people. Sites like Twitter, Facebook, YouTube etc tried to get round this by using the above algorithms and contractors, and that's partly why they're so terrible at it. 2. Moderation is community specific, with each community having different standards for what's acceptable. For instance, a site like 4chan or 8chan may find nearly anything acceptable, whereas the official Disney or Lego site might only want stuff that's appropriate for a young audience. That's why forums work so well, because the userbase and owners decide what's acceptable there, and those outside of said grouo can join/not join based on their preferences. Same with Reddit to some degree, though that is complicated by people being able to move between subreddits so easily and them being hosted in the same place. Unfortunately, many of these larges don't have this. They have one free for all open space where hundreds of different communities are forced to interact with each other. They stick millions of people into a newsfeed/search/whatever that despise each other's views, have completely ideas about what's acceptable and hate every ounce of the other side. That's a recipe for disaster. Putting those who fundamentally hate each other in the same area for hours per day leads to a toxic atmosphere, and creates a situation that's almost impossible to police well. It's why school and prison are so bad; the kids and prisoners just have too many fundamentally different, conflicting worldviews to get along. The only way to fix this is to: 1. Accept that ommunities should be moderated by their members, not robots or contractors. 2. Split the community into smaller ones where people can set their own boundaries for acceptable behaviour. 3. Try and stop intercommunity trolling as best as possible