Grace, I know on Facebook not just anyone can assess your profile. The person has to be accepted by you as a "friend" before they can see your information. I don't know about My Space.
It's just incredible to me the extremes the WTS goes to control its members! I wish more JWs would wake up and realize how deeply the WTS has taken over their minds. The mind is a terrible thing to waste on the Watchtower Bible & Tract Society!