I like creating blogs and avatars nevertheless there are so many options available that by the time when "I finished" I had already spent several hours!!! And still I am thinking about exploring my options :)
I think that our students would love to interact with blogs. I am thinking about Socials Studies for example as a tool to open discussions about a specific topic where students can express their thinking and defend their posture. In Science it would be a great journal to keep their entries about the week.