He's famous for being famous which, if you think about it, means he is a perfect match for Twitter.

In more ways than one.

I use Twitter for all sorts of stuff. It's been awesome for me. I filled up a cryptography class I wanted to give, I ran 2 different surveys, I crowdsourced the content for a poster, I've started innumerable conversations on things, I've directed people to blog posts I wanted to highlight, and I've got 3 months of marketing plans that all hinge on getting the word out over Twitter.

Twitter is useful.

Now, can someone explain how Scoble is useful? Because again I don't know why the hell we've ever listened to him.

I'm curious, do you know about http://identi.ca ? If so, why would you consider Twitter to be more advantageous?

Nope. Don't know anything about it. I use Twitter because my Twitter network is large enough to do cool things with.

Because more people use it, it's simpler, and it's prettier. identi.ca serves a very niche audience.

I think he is somebody who bothers to write.