I think this is a really good idea.
I've always wanted another system in livejournal, so I could add people to my list that I know, but I don't like to read their journals everyday in my friendslist, so it would be a way of keeping track of people, and having the option to remember and check in on their journal every once in awhile.

As for the results, more were people that I knew of from another community that I went to, so many people shared friends.