Need to help others understand the rationale and power behind blogging? Here's the latest video in Plain English by Common Craft. They don't really make the connection to education but the thing to remember is that blogs offer authentic writing for an authentic audience, an audience greater than one, the classroom teacher.
In addition, the collaborative, connective capabilities promote engaged writing. As I've written before: How do we improve as writers? We write. Blogs offer opportunities to write and respond to commenters, to dialogue with those who read our work. Our audience potentially reaches far beyond the four walls of our schools. How cool is that for our students?
If you haven't explored blogging possibilities in your classroom, watch this video to understand blogging in plain English.