Mr. Zuckerberg many people disagree with you. Facebook is not perceived of as email, where you send information to others. It is perceived to be a place where you can put up information, a journal so to speak, and share parts of it with friends and other parts with the world at large. Facebook is the medium by which the sharing takes place and as such *should* not have a say in the matter any more than does a piece of paper has a say in who can see a love note written on it. The perception is wrong, of course, that is why there is outrage.
Facebook has many problems. Privacy is the worst of those problems. As with email one should not put anything on Facebook which you would not be willing to have the whole world be aware of.
When a truly private system arises Facebook will reap what is has sown and go the way of earlier social networking sites. I don't wish this on Facebook, only that they recognize the importance of privacy. Today's teenagers will become tomorrows adults and they will not want their high school angst and insecurities displayed to their adult friends.