Google + Circles for the Classroom

I found this from a Tweet from "mrpotter".  It is exactly what I was looking for to be able to use in the classroom.  It details how you could create a "circle" which is where you could put your students.  Then when you (or they post something) you can set it to only send to that room so your students could be on at night and you could see their questions or even better they could see each others'. Also you can have up to ten people video chat at the same time which would be great for students working on projects at home (and what is scaring Facebook since you can only chat with one other there).