Edmodo – Free Private Microblogging For Education. From the FAQs:
Edmodo is a private microblogging platform that teachers and students can use to send notes, links, files, alerts, assignments, and events to each other.
Teachers sign up for accounts, and then create groups. Each group has a unique code which is distributed by the teacher to the class. Students then sign up (no email address required) and join the group using the code.
More on Edmodo Blog.
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