This is interesting I did not know this existed.
Do you have to approve the conversations first before they were published to the website?
I guess I am like really late with this but I JUST found out about EDMODO and it's amazing. I hope I can get this up and running soon.
I think that Edmodo is great. Your students can not only interact with you and the content but they can also interact with one another which helps with difficult concepts. They are able to talk about a book for example. They can discuss themes, symbolism, etc. Yes, you should go back and make sure no one gets on the wrong track but, I think it is a wonderful study tool.