Warhammer 40,000 Fanon Wiki
In short, to any true and mature fan of 40k...
This [1] place will give you cancer.
The Heresy
The w40k fanon wiki is, as the name suggests, a wiki devoted entirely to fan based works regarding 40k. At first glance, such a thing resembles an amusing little diversion.
On closer glance, it reveals a den of insanity, heresy and disease.
While not all articles are entirely made of fail, many are, and in such a manner as to be hilarious to the extreme. As well, the userbase seems to be comprised mainly of 16 year old boys with delusions of grandeur (at least one claiming to have "psychic powers". At one point, long ago, the Wiki wasn't so bad, but now it is a hive of scum and villainy. The amount of Mary Sue Space marine chapters is ridiculous, lacking any form of readability.
It must also be noted that the Fanon Wiki has specific pages marked as "humour" - this implies that the rest are supposed to be taken seriously. Which is most humourous of all.
Also, the Wiki has begun to steal the stuff from the Dorn Heresy and paste it into pages on the wiki, take art from Devientart, have stolen the Angry Marines (FUUUUUUUUUUUUU).
Notable Abominations
Sons of Lucifer[2] - Vampire LARPers gone too far
The CY[3] - A Race of Trillions of nice but also awesome robots in ten planets
Blaze Ravens [4] - Fluff-raping so bad, we made the Blaz Ravens chapter just to mock it.
Angry Marines [[5]] - THOSE SHITNUGGETS STOLE THAT ARTICLE FROM US! (Seriously, most of the page is copied from here, word for word. The parts that aren't copied are unfunny.)
http://warhammer40kfanon.wikia.com/wiki/The_Xai%27athi_Project The Xai-thi project, a massive pile of shit. Stolen from Mass Effect, Halo and a dozen other things. Suggest maximum trolling.
More to come