If you blog, what's your reason?

I have idea nuggets in my head, we all do.

But when I blog about them, they crystallize. I might 'think I think' something, only to decide I was wrong about _____. All of this happens in the blogging process, and it serves as a permanent memory of otherwise temporal (RAM) type thoughts. I can return to the posts later and revise the words, which in turn revises my actual opinion as well.