Edmodo recently hosted a virtual conference in which teachers presented how they use Edmodo in their classrooms. There is a video archive of these videos where you may find some ideas for using it in your own classroom. Presentations are focused on topics such as STEM, Student Leadership, Global Read Aloud, and Project Based Learning among other things. Go to http://edmodocon.com/ and click the "View the Recorded Sessions" button to watch the videos.
There are also some EdmodoCon 2012 videos that are still very relevant including a session on Edmodo for Young Learners- http://edmodocon.com/2012/#videos