Seriously, what is it with Twitter?

I've always never really been one for Web2.0 applications - but in the last week curiousity got the better of me as I joined Flickr. I must upload more pictures and try and get a feed going with my blog. Anyway, today I was on another forum reading about Twitter. Now, this is something I have never, ever, ever understood. Posting little messages about what you are doing? *yawn*. But actually, I can't stop posting! There's something addictive and I cannot seem to stop. I find myself styling my Twitter page, working on a feed for my blog, and posting every minute! It's addicitve. And with the Twitbit firefox addon, I can do it without opening the webpage! Amazing!