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In the ever emerging world of microblogging sites, edmodo is designed for use in classrooms or at least designed for use by teachers to keep students updated on assignments, sharing during backchannel discussions. A little cleaner looking than twitter and doesn't have the same clutter or posts that are not warranted. Probably still blocked in schools, but at least worth looking at if you are considering microblogging with your students for instructional purposes.

Another potential tool to use with your students. It's like twitter in that it is a microblogging tool, but is meant solely for educators and students. You create an account and a group that your students join. I don't know how to use it yet but it does seem to have potential.

Great twitter like site designed for schools and classrooms. Great for sharing research and backchannel conversations that have research breaks built into them because students and teachers can embed images, videos, and links for sharing. If a school is concerned about twitter and access, this would be a great classroom alternative. 

Updated post with a compilation of uses for twitter in the classroom.