I got this from a project by Seth Godin called "What Matters Now".

http://sethgodin.typepad.com/files/what-matters-now-1.pdf

It was done by Jessica Hagy who has a great blog called "Indexed" which is full of cool little diagrams like these.

http://thisisindexed.com/

The more I learn about the world, the more I realize just how correct this little diagram is.