After 11 years of running MetaFilter.com, I (and the other moderators) have been through just about everything, and we've built dozens of custom tools to weed out garbage, spammers, and scammers from the site. I'll cover how to identify and solve problems including identity, trolling, sockpuppets, and other nefarious community issues, show off custom tools we've developed for MetaFilter, and show you how to incorporate them into your own community sites.
http://schedule.sxsw.com/events/event_IAP6072
