Using blogs in the classroom

My reaction to Don't Feed the Trolls could be summed up in one phrase, "do unto others as you would have others do unto you." Generally I would expect students to know the "rules of the road" if they are going to be posting on a blog. I would not want to police the trolls, but may look for other ways such as approving comments, etc. before posts could be made public. I thought to look at Mr. Harbeck's blog next and immediately saw how a blog could be useful in my own classroom. I liked the layout and basic features. 

Suddenly my mind was racing and  I was thinking what is the first thing I would post on my own classroom blog? I would probably note on my own blog the simple yet powerful notion from Richardson's article: Responsible, productive citizens don't always agree - but when they disagree, they always do so civilly. No, no I don't want to start with content, what is a top tag I wonder. Widgets... How do I...?