I forget whether picture tagging came along before or after I left, though I know I've seen the feature. It was probably some time in the grey area between when I stopped using it regularly and when I actually deactivated my account. Anyway, I see your point about how you could easily get creeped out about Facebook making it so easy to datamine that stuff. It doesn't bother me personally because I just take the McNealyesque view that any information that I don't make a deliberate effort to control access to is already public. But that's just because I'm a security guy and my brain is correspondingly warped; I make no claim that this mindset is normal or even healthy.