My apologies if this has been requested before, but I'm anxious to protect my users profile information from casual visitors. Is there a module out yet that would enable registered users to decide who can view their info?

If this was a wishlist I'd ask for the following:

User has option to:

1) Block contact from any specific user
2) Has option to make profile viewable by a) anyone, b) registered users and friends, or c) Friends only

Sorry if I'm asking for the moon here, but if anyone could help a total idiot like me - I'd be very grateful