Not everyone whom I marked as a friend in social graph games version 1, do I still hang out with. Some moved, others I have nothing in common with any longer. Hobbies change, etc.
Just as I consider Linkedin and Facebook to be two wildly different networks, I pretty much find sites in general to be this way. Sure, some friends are portable... but in many ways social sites are sort of an archive for "this is who I was hanging out with then".
Friendster is sort of 1.0 (ok, ISCA would be 0.1, and Livejournal something like a 0.5).
Facebook 3.0 (though Facebook is filled with friends 2.0 (aka high school))
Twitter, well I don't know what Twitter is.
But do I really want these to be portable? Not really.
Do I want to keep up to date with my friend's contact information?
Sure, that sounds excellent.
But the rest?
Not so much.
If Apple did a better job with Addressbook I would keep more information there (and keep it updated via some system (plaxo++)).
So what does all of this mean?
I am really bored with social sites, social graphs, and how many degrees I am away from anyone.