[drdaeman]

There are ways to counter this. For example, it can be said that Facebook isn't your bathroom. (Yes, this isn't exactly solid argument, sure.)

Still, I'm absolutely sure it's best to keep private stuff to oneself, and parties you trust. With understanding of full consequences of doing so. If one trusts Facebook, they'd better think why do they do so, as their trust may be misplaced.

I think one of problems is that when users post data they don't even think they send it to Facebook - they believe they send it to their friends there.