I've found that I post to my internal blog at work, but I don't post as much to my externally visible blog. Why is that? I suspect that internally, I know my audience―my coworkers―and we have a lot to talk about. But externally, I don't know the people reading my blog, and I don't know what we might have in common. So it's hard to think of things to say. I happen to be this way in offline life too. I say a lot to people I know but I find it hard to talk to people I don't know.