They haven't had security 'breaches' because nobody ever called it that, but FB has been leaking data out the back door for years. The amount of info that you

They haven't had security 'breaches' because nobody ever called it that, but FB has been leaking data out the back door for years. The amount of info that you used to be able to pull from Facebook's API was incredible, and most people didn't realize it. Even information as bland as friends and friends-of-friends is enough to build a useful social graph around a person. (Years ago I did just this, and it was amazing how the graph clustered all my different social groups)