One of the things that I've noticed about student blogs is that each one is very different. Everyone has their own idea of how to create their daily paragraph. Each student has their own voice that comes through in their writing and makes it their own. Writers talk about it all the time: finding your voice. On their blogs, students are able to find their own voice, while still learning basic writing and editing skills.
I think learning how to express yourself in writing is one of the things that makes education so crucial. By writing down our experiences and thoughts on things, we not only leave our mark in the world, but we learn to think through our own experiences and elaborate on our opinions. Writing makes us better thinkers, and the world can always use better thinkers!