Something which seems to work well on other sites is the ability to be able to leave comments on a user's profile page. Examples are http://en.wikipedia.org/wiki/User_talk:Kevinalewis and http://en.wikipedia.org/wiki/User_talk:Loyola. This could add tremendous value here. It would enable discussions with a person, notes to a person as well as the ability to issue friend/group invites. It does seem to me to improve the social space.
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