You're wall going to prison.
This is an awfully good illustration of one of the many reasons why I don't drink the social-networking Kool Aid. I make exceptions for Goodreads and RateYourMusic, plus a few forum accounts, but that's it.
Here is an excellent collection of resources and tools relating to security and privacy on the internet, courtesy of Tunafish at the CrunchBang Linux discussion forums. Those who want to take a slightly more 'proactive' stance against the collection of their information should find this worthwhile reading.