We are very close to having a new social course format for Moodle that closely mimics Edmodo or Facebook in Moodle. This new course format will be released to the community once completed. The project has been 2 years in the making with only recently securing funds to have a Moodle Partner develop the social course format. The Michigan REMC organization has taken lead on helping fund this project and it will first be made available to Michigan K-12 school districts followed closely by the full Moodle community.
Here are some current screen shots and an article on moodlenews.com