I don't consider it a secret who my friends are, not even most of my conversations. But there is a difference between that, and the industrialized scooping up of it, the storing and correlating it forever... me, today, is not what worries me; Dr. Strangelove is.

Imagine spooks following you all day, each day, and every time after you talked with someone, they walk up to them and ask what the conversation was about. Imagine dozens of spooks per individual, each of them constantly taking notes on paper that does not perish. This is the society we live in, the society that we built while sleepwalking. Even the spooks aren't aware of what they're doing, not really.

In FB you use your wall to publish the info you want to share openly, the other important stuff like private chats, online behavior (clicked links, friends you visit, photos you see, time of login/logout), groups you participate, GPS locations of places you've been or are and etc are not supposed to be open to anyone.

Yes, but experience shows it's FB's interest that you share as much of your data as possible. It's not going to change, publicizing your data is its whole business.