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Edmodo is a social networking website for teachers, students, and parents. It is marketed as the Facebook for schools. Teachers can invite students into private groups that can be used for online classroom discussions, but in a format that keeps the teacher firmly in control. Teachers give students a class signup code, which can be deactivated once all students have signed up, and students in turn are encouraged to share the code with their parents, allowing them to monitor their own child's activity. As an invitation-only social network, Edmodo is meant to mirror a secure offline classroom that intruders cannot access, with rules of decorum enforced by software. For example, students are not allowed to pass private messages to other students in class. They can post only to the group or the teacher, and group messages can be moderated by the teacher.