I don't have any personal information listed in my profile, except for my email address (which I changed to a new, more anonymous address). I have to have an email address to join here. It appears that there is no default setting for it to be viewable to "no one". I can only select, "Everyone," "Contacts," "Friends," etc. So, since I couldn't select that "no one" could see my email address, I had to nix the friends in order to keep it unviewable. Make sense? If there is another way of doing it, though, please let me know. I'm not suggesting that the friend network is unsafe, but it does allow members to see your email address.
Sober date 10.16.11