I had one of these blogs years ago and I found the questions I had to look up were great subjects for blog posts. Many of them wound up being pretty basic: thread safe singleton in java, sort a list, etc. This isn't a PhD thesis, it doesn't have to be profound, you're just trying to demonstrate you can write some code and communicate.
I don't think I did a good job of articulating my point. By the time I wash out all the domain specific stuff, I believe I am left with a post that is even less valuable than a link to a Stack Overflow discussion about the same issue. Does that make sense? What value am I adding to the world if I spend an hour typing up my thoughts on this and I could have just linked to SO? Also, my blog traffic is effectively 0 people. I don't think it is wrong for others to do so, it just isn't the right thing for me.
EDIT - sorry, I missed the fact that we are talking about producing a blog as a proof that I understand and think about programming in a certain way (e.g. as useful to people evaluating me)... You are absolutely right, then, and I withdraw my objection.
I am not currently looking for work but if I were, I think a blog focused on dev would be more valuable than my collection of half-baked github repos. Food for thought.
