That is interesting. If you want to learn more about surveillance you can read this interesting article.http://chimac.net/2010/09/26/who-is-watching-you-nine-industries-that-know-your-every-move-via-margots-news-views/
This is exactly the reason I refuse to use Facebook, and many other similar services. And to my own benefit too. I picked up a psychopathic stalker a couple of years ago, and he was extremely thwarted by not being able to find any personal information about me on the internet whatsoever, except of course on my website where he latched onto me. Get ready folks, these massive privacy intrusions are just the beginning... there's much worse to come!