I signed up for the Coursera.org Social Network Analysis (SNA) class taught by Lada Adamic of U. Michigan. I "attended" the first lecture, which was a pretty good intro to SNA.
The result of the class is that I made this amusing graph of my Facebook network seen below. You can see I am bifurcated between my school/professional network and my family/hometown network. They really don't know each other. And we will keep it that way.