Here notes that Dennis Markuze appeared to post at the Atheist Experience Facebook page under the pseudonym Ftbullies Ftbullies; the comments section reports him (often with links) posting at EvCForum, Rationalresponders.com, Australasianskeptics.info, Secular Cafe, Graveyard of the gods, Atheistforums.com, alt.athiesm Usenet, Atheist Ireland, TheScience Forum, and reddit.
I mentioned this
thread in the replies as well, or at least it is in moderation limbo.