I spend a lot of my time around a computer. I work on one and spend most of my free time coding or discovering new things online. So a blog naturally fits into my lifestyle. I don't have to make big life changes to run one, and it's been years since I've had a journal so it will be nice. If I lose interest in it, that's fine.
But, I don't really understand why you assume that I don't participate in much live interaction. Why do you think I left Facebook?
I love hanging out with people and discussing a variety of topics. But I also like to write down my thoughts. I figure some people might like to see them from time to time.
I am currently working remotely from a very rural area so I don't get to see friends much, and I am about to move to a new state. So a blog / online journal will definitely help keep me from going bonkers without the level of social contact I desire.