Oh, good ol' days of the internets...

You know, your question got me thinking. I've been trying to imagine a open platform for social networking and I just...can't...conceive of one. Maybe my mind is too limited and uncreative, but I just feel like a open platform would defeat the purpose of social networking sites.

For example, LinkedIn - a social network for professionals. If LinkedIn became "open," its utility disappears. You would not be able to trust your "connections" because the network wouldn't be full of professionals. Closed platforms are a bit more trustworthy (and only a bit!). Facebook is probably as open as it gets.

That's my guess anyway.