I had no idea how close Whoville is to Mordor. It's amazing that Sauron didn't destroy the Who's, what with all the noise from their Jingjinglers, Floofloobers, and Blumbloopas. (The Fantasy World Map from Dan Meth)
This is but a small sampling of the awesome, updated Map of Online Communities by xkcd. The first one was in 2008 and you can see how much the land of MySpace has shrunk in two years. I also enjoyed Kanye's Island of Sadness and the Hastag Games Whose Popularity Confuses and Depresses You. Bonus: Neatorama got its own island! (Thanks to @benelling for the heads up)