Who Comments on Blogs, and Why?

On most websites or blogs, the ratio of readers to commenters is gigantic. On this blog, a post that garners 40 or 50 comments is considered quite a bit, even though there are many thousands of readers. The stream of comments can take many shapes, depending on the nature of the post. And, once again depending on the nature of the post, the commenters here can seem like a fairly diverse lot. But lately I got to thinking: what kind of person comments on a blog, and why?

I like blogs as much as the next guy, but I don’t think I’ve ever left behind a comment, even though I have plenty to say about lots of things. So what distinguishes me from a blog commenter?

I realize there is a selection problem here: anyone who responds to my question about why commenters comment is, alas, a commenter. Which means that regular commenters will be overrepresented in the comments — unless, of course, a whole bunch of you who never comment decide to go ahead and log in and, in the comments section, tell us why you never comment. Or why other people do.

Comments welcome.