I don't know most of these......
Interesting to see the rise of Edmodo in this set of statistics.
"Schoology provides an enterprise level learning management system and configurable social network. Instructors and students can easily create, share, and manage academic material through a social networking interface.
By incorporating learning management tools into a social environment, Schoology provides a means for teachers, students, parents, and administrators to seamlessly communicate and collaborate on academic issues."
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Groups interested in lms