Actually, I do know what Twitter is. And I always had a hard time explaining it until I saw this video by CommonCraft (thanks RecruiterGuy for pointing to it on your blog).
So, you still might think Twitterers are freaks, but if you watch this video, you'll understand their "issues" a little better.
By the way, here's my Twitter Profile: http://twitter.com/dennissmith.
If you are on Twitter, email me your profile so I can check out what happens in your life in-between all the important stuff.