I recently started a thread in Meme Research on this subject, but since it's on a fun subject, I'll (sort of) duplicate it here.
If you think it's a meme, let me know on that thread, but for here, I was wondering how many of you know of websites with a focus on riddles, prominently but not necessarily of the visual type featured on the site Notpron. One of my old favorites is Dumb: The Game which is nice because the puzzles are of varying difficulty, and you can attempt them in any order you like.
