There are two kinds of relationship, "deep" long terms etc. etc. and low maintenance "weak" realtionships of which we hold many.
Are "weak" relationships less useful? Most of us do not like these much, while some people with huge networks seem to like it very much.
One may say that "weak" relationships Suffer from "friction" problems. It takes time to start a conversation, to get the basic update on what is up etc.
(vs. the theory that only "deep" relationships are useful. A widespread belief, I am questionaing here)
Friction may decrease significantly with online tools like facebook etc.
If this theory is true, then having more "shallow" facebook friends rather than a few "deep" ones, may simply be that people like it more. And the internet changed the math by reducing friction a lot.
There is an interesting study, where resachers found that kids need very little to feel friends. Just to hang together.
It blows many myths on the "reality" of friendships, but so be it.
May facebook improve our social lives, indeed?