"Traditional web 2.0 tools in a k-12 classroom environment create concerns over privacy.
Edmodo has been built with the privacy of students in mind. Edmodo provides a way for teachers and students to share notes, links, and files. Teachers have the ability to send alerts, events, and assignments to students. Edmodo also has a public component which allows teachers to post any privately shared item to a public timeline and RSS feed." One blogger titled his review of Edmodo
"If a Teacher had Designed Twitter"