Disagree, there's a fair amount of "social janitorial work" that goes on here at HN. I mean, I just signed up to comment here today (have been reading for a while) and the community here is based on something similar:

"Be civil. Don't say things you wouldn't say in a face to face conversation."

People here are pretty strict about the types of comments that fly; for example, memes and dumb jokes are not something that the community here accepts. Personally I think that's great and the site is better for it, but it's not censorship to hold the other people in your forum or message board to certain standards of communication.