I never noticed in the past looking at the blog, but there appears to be an issue in the code for the blog.
When you log into the front end and go to a blog post, it provides you the option to make a comment.
Above the comment box area, the following is written above:

* %s comment

You can also see it in the screenshot I attached.

I am guessing it's supposed to pull the customers name.

Just a minor bug for the to do list.