While this suggests that listing peoples "friends" publicly would be a negative, it does not remove the advantage of publicly using your name on a social website.  Reconnecting with someone you know in collage but lost track of still happens in Japan.  So, the best option for the 30+ crowd might be public profile, private relationships / conversations.<p>PS:  Another option would be to allow sub groups of friends on a social site where each network has its own independent "wall" that they can post to.