Update: SBN showed me how to find out who has rec'd a fanpost, and I managed to track down the culprit. He had about 12 user accounts registered, all of which have been banned, and as soon as SBN does their ip ban magic I'll set the "featured fanposts" section back up.
You may have noticed that the "featured fanposts" are no longer at the top of the fanposts section. I removed it because whoever has signed up for multiple accounts and is rec'ing the crap out of the worst fanposts out there is really starting to get on my nerves, and they will stay gone until SBN runs down which accounts have been doing all the rec'ing and deletes them. That is all.