IME, ban fast and hard. I used to do this back in the day with webrings and free forums. Quality drops to the level of its lowest member. If it's a personal si

IME, ban fast and hard. I used to do this back in the day with webrings and free forums. Quality drops to the level of its lowest member. If it's a personal site, you don't have to tolerate idiots. People tend to not say nice things on a place full of graffitti. Also my experience, but it's not too bad, the ratio seems to be about 1 in 10000. But if you have a million people, I can see it going bad fast.