However, I have to admit that I grew used to the fact that it is easy to contact a node in my social graph, without having to go hunt for their email, or maintain my own contact database.

After all, the social network should be about people, at least to me. I don't care about corporate pages on social networks, they might as well only exist at normal websites outside of the walled garden.

I guess thats my point. In my book, social networks are about people. And not being able to easily contact people is pretty much useless.