At Manchester Community Schools we do not block blogs. However, we do block social networking sites such as Facebook and My Space.

I think that blogging could have applications in the classroom. If you posted daily lessons or readings for your students to respond to it could be quite useful in allowing students time to submit a response at their own pace. You would also have a record of the responses that were made and other students could read and respond to them as well. I could see this interaction being quite useful in my classroom.