hey! I remembered this site as letting you have one try then wanting to you to become a paid member -but seems I was wrong or it has changed. It rocks!! I am going to test out the teacher management functions with some volunteers over the next few days and see if it is worth using in class.
Anecdotal and experimental data
seem to support claims that both synchronous and asynchronous exchanges, in
first- and second-language student populations, encourage interaction and help
improve the quality of written and spoken discourse.