See http://www.reddit.com/r/IAmA/ for lots more.
It originates from here: http://www.reddit.com/r/IAmA/
Also, depending on your thoughts on 4chan and reddit, you could say that differentiating between them is pedantic, but that's another question.
http://www.reddit.com/r/IAmA/comments/gw2mt/i_have_dissociat...