Here's something weird. I'm a computer professional. I have an information systems minor, worked as a network admin for almost 8 years and a was a computer technician before that. I have a few minor certifications. I'm a fairly compulsive tinkerer. But I have almost no idea what twitter is. I don't think I've ever visited the site. From what I gather it's more or less like setting your status on IM or Facebook. But changing it a bunch of times throughout the day. And people apparently care.
I frequently think that I should check it out just to be informed, but for some reason I always do other things instead. Like writing this post, for example.