What is the role of the blog

What is the role of the blog words on photography:

What really got my hackles up was rather sophomoric post by Mr. Colberg today about what a photograph is as it compares to a photo-illustration. This post showed me that he is swimming in unfamiliar waters. He could have easily referenced the Reuters handbook on what is accepted digital processing. It is very clear, probably too clear for Mr. Colberg.

The lack of an ability to comment on this post directly, save for emailing him, also gets to me.  How is this really a discussion in this day and age in the blogosphere? I am not always a fan of comments, but in this case, I wish they were there.