I've taught online using Edmodo . Like Moodle, Edmodo is a Learning Management System (LMS) which allows you to share course content, updates, send messages to students, and manage student memberships. Students are able to download assignments, post replies to updates, send messages to either you or the entire class, and access their grades. Another interesting thing to note is that Edmodo's interface is somewhat similar to Facebook. Updates are posted with a profile picture attached. Replies to updates can then be posted and will appear just below the update. No "Like" buttons, invitations to play "Farmville" or ads on Edmodo's site, though! One of the things I think some Middle and Secondary School teachers (and parents) might like about Edmodo is that students are not able to send private messages to other students. One can then rest assured that no inappropriate correspondence is privately happening in the course. If students want to send a messag...