let's just say being been on both sides and currently have a facebook group of 12k people. Moderation is a real difficult thin line to thread. to much, and everyone is unhappy, to litlle and everyone is unhappy. just enough and still people are unhappy.
i believe in free speech, any speech (even insults) bit like X. but that only works if it's for a community that's close together on my facebook group i don't do any moderation just trying to keep adverts/spam at bay. but that only work cause it's for a small city, and people know each other. they know if they rant it will also stay there forever. 🙂
for thaivisa (this one, still call it with the old name) there is so many members that doesn't work