Ok, I definitely am down with Twitter. It's the closest thing that artists and actors, etc. have to direct interaction with their fans, and as a social tool, messaging system, and electronic communication device it's purely genius. If you say you aren't into it, I'd hazard to guess that you haven't really tried. Twitter-haters are lame.
Try opening an account and searching a topic. Where else can you instantly see what a huge community of users are saying about a given subject so quickly? It's really amazing and definitely fascinating on many levels.
Here's what I can't stand though... I know Twitter asks "what are you doing?" But do we really want or need to hear it all? Do we need to know that you are brushing your teeth or walking your dog? Save that stuff for your diary. Most of us really don't care.
Use it to tell us interesting things. Your thoughts. Things you are doing or did that are truly of interest, different, or curious. Send us links to cool shit. But please don't tell us what you ate for breakfast. We don't care.