Check out this short informative video:

http://albumoftheday.com/facebook/

If you want to know more, there’s a recent article in the Guardian about Facebook, it’s rather long and starts with a lot of stuff about why the author doesn’t like it, but towards the end he goes into the shady side of it:

http://www.guardian.co.uk/technology/2008/jan/14/facebook

Big Brother is watching you! Creepy stuff!