Randall Munroe writes the legendary XKCD comic strip online. Besides being hilariously funny he also produces a few fascinating infographics. His latest is below, a to-scale map representation of the relative sizes of various online communities.

Go here for a large version.

Munroe’s observation:

Best trivia I’ve learned while working on this: “Man, Farmville is so huge! Do you realize it’s the second-biggest browser-based social-networking-centered farming game in the world?” Then you wait for the listener to do a double take.

This is the second of these maps he’s done. His first was in 2007. Empires rise and empires fall. Copyright 2010 National Public Radio. To see more, visit http://www.npr.org/.