Edmodo Is a Social Network for Teachers and Students [Education]
Edmodo is a teaching tool modeled after social networks with a focus on communication and not merely distribution of information from the teacher and grade reporting—although you can certainly use those functions easily enough. As an educator you can share files, links, assignments, and grades as well as issue alerts and updates, dialogue with your students on a Facebook-like wall, survey your students, and manage map out your class syllabus on a public calendar. As a student you can contact your instructors directly, message other students, interact in the public discussion spaces, and even access Edmodo from your mobile phone via their mobile-optimized page to check assignments and more.
Edmodo is a free service. Visit the link below to sign up and test it out or read a detailed breakdown of the teacher and student features here.