This seems like one of those "Good for the user, bad for the network" type features. It's great if you're an established user with a clear friend network that y

This seems like one of those "Good for the user, bad for the network" type features. It's great if you're an established user with a clear friend network that you want to communicate with, but it works to isolate different communities, and challenges the "open-by-default" assumption that arguably defines twitter and the way it works. This kind of asks the question that if everyone moves to this feature then what is twitter and how does it differ from Facebook.