Check this out - Wolfram|Alpha Personal Analytics for Facebook. It's pretty impressive what they can do with the data and makes for a fascinating perusal. It's also really scary some of the stuff they can do, particularly looking at your networks of friends. It was able to identify and segregate what I consider some quite subtle and overlapping friendship groups with astonishing accuracy. Goodness know what Facebook could tell you about me if they wanted to...

(p.s. for some other Wolfram Alpha related fun check this out: https://www.wolframalpha.com/input/?i=psy%20curve)