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As you can see, students are commenting because they are required to, and because it's easier and more obvious how to do so.

Required as in graded?

This really impresses the students, but you have to make the blog public and share it with others to do this. Since there is moderation of comments, nothing will come up without your approval, so go for it.

I like the map. So you visit other blogs leave link back to classroom blog?

This is still a list of links, but there is much more interactivity. Go down to the SSR post, and click on the title to see comments.