Peter Warden has a great post up on his blog that looks at how Facebook users in different states are connected to each.  He finds that the U.S. can be divided into roughly seven regions, which are visualized above.  Be sure to read the full post.

About the Author
Todd Zeigler
Todd Zeigler serves as the Brick Factory’s chief strategist and oversees the operations of the firm. In his sixteen year career in digital, he has planned and implemented campaigns for clients including the Pickens Plan, International Youth Foundation, Panthera, Edison Electric Institute, and the American Chemistry Council. Todd develops ambitious online advocacy programs, manages crises, implements online marketing strategies, and develops custom applications and software. He is bad at golf though.