User blog comment:Tiololo/What Was The First Ever Pasta On This Wiki?/@comment-5643552-20150410002408

Yeah, They're Everywhere is the first page posted (not first creepypasta, though). Check the page history and/or 's earliest contributions of you don't believe me.

Jeff was posted in August 2011 (about a year after the wiki was created) by some guy claiming to be the author's brother (User:GameFuelTv). I know the story in its current incarnation is relatively new, so it isn't outside the realm of possibility that this wiki was one of the first places it was posted. Also, the existence of this (note the upload date) strongly suggests that the Jeff the Killer we all know and hate is, in fact, just a fan story.

Ah, this wiki does indeed have an interesting, fucked up history...