Edmodo

=Edmodo is a private microblogging platform for teachers and students to share ideas, files, events, and assignments.=

Think of Edmodo as a private, online classroom where students can ask and answer questions, access files, assignments, grades, and view a classroom calendar.

Students do not need an email address to create an Edmodo account. Students can only send messages to the teacher or whole group - no private messaging. The teacher has access to all student accounts, passwords, and history. Students can access class materials, assignments, and due dates anytime they can get online. There is even an option to receive text messages or email alerts when a new assignment is added to the class.

@http://www.edmodo.com/