Interesting article talks about the pseudoscience of rigorously determining "Briggs-Myers" personality types and compatibility metrics between people. Personally I think this is more of an art than a science. In anycase, it appears that there will be a vast amount of "social" data mining on the internet in years to come!
The Atlantic Monthly | March 2006
How Do I Love Thee?
by Lori Gottlieb
http://www.theatlantic.com/doc/prem/200603/online-love