Social Media
Open Study is a message board for students in search of help answering difficult questions. Students could use it just for that purpose, but Open Study provides more than that. Open Study offers students the option to create or join online study groups, subscribe to other students' updates, and provides students with a place to record their notes online.
Schoology - your digital classroom, combining a learning management system with Social Networking site.
HootCourse - take your class conversation online, HootCourses are held online, using Twitter and Facebook as a virtual classroom space.
Twiducate - Social Networking for schools
Scuttle Pad - a safe, supervised, place in which children can communicate with each other.
Edmodo - free private social platform for Education
http://www.edmodo.com/institutions - You can also register your school/district for a dedicated Edmodo