Here are BlameThe1st top 11 disturbing MLP fandoms:
11. Incestuous fan shipping of Apple Jack and Big Macintosh.
10. Story of the Blanks.
9. Tyrannux's fanart.
8. Gavalanche's fanart.
6. Princess Molestia.
5. Megasweet's fanart (cloppers in general).
4. Luna Games.
2. Sweet Apple Massacre.
1. Rainbow Factory.
Update = he is changing up his (now 13) disturbing MLP fandoms, so I'll update with a new list on a different blog post (once he is finished with his new list).