How I Use It
I use Edmodo to partially "flip" my classroom. I can record screencasts giving directions for a particular task, provide a link to take them to the website in which they'll be completing the assigned activity and then they complete it at their own pace, referring back to the directions as needed. When they've completed and turned in an assignment, they can move onto the next one. This has been great for personalized and differentiated learning!
I actually use Edmodo successfully with kids as young as 2nd grade. Once they learn how to login in, they are adept at navigating through it. Edmodo is a "one stop shop" for teachers---they can can assign and grade tasks and projects, push out content and encourage student collaboration and communication. Edmodo also has great resources for digital citizenship.