A bunch of lj comms got kicked off by livejournal including some fannish communities (apparently espcially from the Harry Potter community?) because a watchgroup reported communities that had incest, child-fucking, pedophilia in among their interests.

There's some discussion about whether changing interests from "incest" to "incest in literature" (or more fandom specific terms like Weaslycest or Wincest; or you know, just not having it in your interests) is safer. There is much indignation and internet-lawyer speak. A write up can be found on fandom_wank.