Bozo filter. When you ban someone for posting crap, don't delete their crap, just flag it and only display it to that user. By giving the crap posters less feed

Bozo filter. When you ban someone for posting crap, don't delete their crap, just flag it and only display it to that user. By giving the crap posters less feedback you reduce their ability to evolve new crap-posting abilities. On the reverse side, you must also identify your best posters. It's easy to forget while dealing with the obvious problems with crap, but you must find the content that is highest-rated, that draws the most traffic, that most contributes to your business goals. Praise them in public. Send them swag. Make sure your customer service system highlights them, so you're responsive when they have problems. The best users are around 100x more valuable than average. Identify and cultivate them.