Injustice will always exist and weirdos will always find a way to cause injustice. Monitoring people and curbing the liberty of everyone is no way to avoid this. This, for me, applies to the world as a whole. I feel differently when you are in some elses realm.
On the other hand, if you sign up for facebook, be prepared to be watched. Its what it was created for and one would be dumb not to expect it. If you are in your own race track, driving your own car, feel free to crash and injure yourself, however, if you are in a private racetrack, driving on their property, abide by the rules or go home. In this case facebook is a private racing track. The internet as a whole, on the otherhand is for the public at large.
I always found it fascinating that the same people who preach about the freedom to do whatever they want, are the same people who will usually try to curb your liberty when you are in their air space. (trespassers will be shot etc) Truly, Facebook can do what they want. We agree to the terms and conditions, and if people dont like it, they can simply cancel their account.
Just a thought!