Docs.com allows you to chart your Facebook friends. Even thought I grew up in Minnesota it looks like I socialize a lot more with people from the coasts. This makes sense since I went to school out east and work in the west.
Thanks to Pete at http://www.openheatmap.com for making this based on my Facebook friend locations:
About Project Graph: At Wharton we’re taught that everything can be graphed. This is my attempt to graph my goings-on.