Brent Burzycki I'm assuming the primary concern you are bringing up is allowing them to comment on your post, since I don't think they can contact you in other ways unless you add them back. I don't think in any world you would be able to control who adds you. (Someone could add your name to the contact list in their cell phone, but if they don't have your phone number or e-mail address, they can't contact you.) And if there is an issue, such as unwanted comments, I believe that you could "Block" that person, which would prevent them from seeing your posts and commenting on them. Michael Bernstein Good point. The serious hackers will usually find a way around any obstacles, so the best approach is to make it as easy as possible to use for legitimate purposes while trying to prevent causal misuse.