I just saw these research findings, and thought I should share them:
Yes, it’s more brilliance from xkcd. It gets progressively funnier from left to right, then breaks the geekometer with the mouseover text.
 That’s assuming yours still works after reading some of my posts
 I don’t remember the context, but somebody online somewhere responded to something I said by saying “that’s the geekiest thing I’ve ever read”. I thanked him politely.