Your funny! even fake/spammer joins facebook/twitter/netlog/orkut/linkdin freely !!!!!! what is wrong there?? members who do not want to be sent messages by spammers got tools such as block and other privacy settings in dolphin and also members can report problematic user and then you the admin remove such person...also that does not mean the spammer can not sign up again....it is everyday issue....best part is make is join by invitation only, i can assure this option does not do any social networking see more site any good

goodluck