That’s where the “digg” functionality will come in. Fellow members will flag the posts as inappropriate, and they will fall to a back page or something. Meanwhile the better posts (and posters) will rise to the top.
We wouldn’t have these things on the front page to begin with. Start them off on a proving ground and promote/demote. It’ll be all democratic.
Just been reading “Wisdom of Crowds” and it seems to be a good approach.