Damn, my cell phone still has a rotary dial.
I'm not a luddite and I love technology. And new technology. I just don't like lame rehashed fads. Twitter is centralized mini-rss. Twitter is a centralized mini, frequently updated, .plan or .project file.
I'm sorry, but greater than 95% of twitter use is just crap I would never care about regardless of the medium. And the 5% that I might care about is generally hacked and deformed by twitter's requirements and usage patterns/styles.
Twitter has caught on because of the tween/teen generation. All the "blogosphere" pundits are using it because little kids out there actually made it popular and somewhat mainstream.
About the only thing I would consider using it for would be as a way to subscribe to magnet links for TV show torrents. But there's already rss if I want to do that.

Besides, I'm not generally a follower. And I have no desire/intention to update people when I'm going to the bathroom.