In your view, what defines social? I'm seeing this as one point receives updates from many other points and announces updates of its own. In the case of DNS, i

In your view, what defines social? I'm seeing this as one point receives updates from many other points and announces updates of its own. In the case of DNS, it's domain record updates. In the case of email, it's messages. In the case of social, status updates, photos, events.