I don't earn any money spreading this information, I'm just passing along this information for teachers who are interested in getting this useful software with their students or children.
"I think that grammar is useless for learning to speak fluently...what do you think?" someone said.
However, if you are interested in creating and customize a free social network for communicating with your student, Ning makes it easy. You can create your own social networks just in a few minutes, adding the content you want and have your students participating and learning. In EFL Geek 3.0 blog you will find very useful information to know how it works.