Scoble’s comments are a little off-base—he argues both sides of the point and wants a lot of cake. The asymmetrical follow is what makes twitter work for most people (he’s an exception in that he follows everyone). The other thing he doesn’t address specifically, but that is far more interesting is the role social software should play in people’s communication mix.

People use email and SMS and like it. Facebook has explicitly stated that they don’t want to build their messaging into a full-fledged email replacement. A lot of college kids don’t seem to care and use Facebook messages as the more personal form of email. In my opinion, Twitter is a more interesting case in that they’ve called themselves a messaging utility and I’d be thrilled if they became the HTTP-based replacement for the current SMS infrastructure. More on that later.