I don't think anyone (by anyone I mean techies or people specifically interested in this, read: tiny minority of their user base) really cares about this. People that do won't rush to join yet another social network and give them more personal info in the hopes that they'd be better with it than Facebook.

I actually think Facebook is doing the public a service by being up front with the lack of privacy you have on the internet. Do not ever, ever assume that you can hand over your private information to a corporation operating under US privacy laws and hope that they'll treat it respectfully (by some conservative definition of respectfully).

Social networks, by their very nature are about sharing personal information, and anyone thinking otherwise should ask Facebook for a refund.