Locked threads, deleted threads, comments from pg requesting that particular people stop arguing, a flagging system where some people's flags have greater weight, hellbanned accounts where the person doesn't even know they've been banned (there's some poor schizophrenic guy who made an operating system called LoseThos that posts occasionally), badly editorialized submission titles.
But, that's what moderation looks like, generally. Every social structure is moderated in some form.