The thing about posting to facebook vs. a blog and then vs. twitter is that Facebook there are categories, pages, things to follow, profile expectations to keep up, etc. With a blog, its pretty much just one way, one page, and thats it. Slim to none interactivity, just the time to compose your post, log in, and actually hit send.
Twitter is even easier, smaller, faster, and ultra-meaningless. I have 'Twhirl' running on my desktop at work and it is as easy as typing what I want to say, then hitting send. Of course editing down my statement to 140 characters is a different kind of chore...
DO IT!