I think Facebook has already lost too Twitter on this front. When people think Facebook, they think private info and friend's pictures. When people think Twitte

I think Facebook has already lost too Twitter on this front. When people think Facebook, they think private info and friend's pictures. When people think Twitter, they think public broadcast mechanism. The identities of the two systems have already been framed -- once that happens it is hard to change the momentum just by competing with features.