Over the last week or so I have been experimenting with Edmodo. We have been posting messages, links to articles for students to read, set up an RSS feed (although we took this down as we were overloaded with items), carried out polls, quizzes and set assignments. It has been successful will the log showing students logging into the group at all times of the day. One thing that frustrated us was the inability to upload work from the iPad into an assignment. When we went to share there was no option from Pages or Keynote to upload to Edmodo. We discovered a solution:
The work will then go into the backpack on Edmodo and from there you can attach it.
or if you are a teacher it will go into your Library and you can share it from there.