I disagree that it isn't Facebook's problem or that you have only yourself to blame.
Facebook is aware of this problem, and it's good for their bottom line. It's not in their best interest to encourage privacy, so they don't. In fact, they actively work to encourage (or, in some cases, force) more sharing, less private behavior.
As there are serious risks, even dangers, involved in over-sharing (not just your over-sharing but your friends' over-sharing as well), I would say that Facebook has some responsibility to protect its users and inform them on the implications of playing fast and loose with privacy.
Facebook is aware of this problem, and it's good for their bottom line. It's not in their best interest to encourage privacy, so they don't. In fact, they actively work to encourage (or, in some cases, force) more sharing, less private behavior.
As there are serious risks, even dangers, involved in over-sharing (not just your over-sharing but your friends' over-sharing as well), I would say that Facebook has some responsibility to protect its users and inform them on the implications of playing fast and loose with privacy.