How I Use It
When I want to poll my whole class, I post it here. When I want to have a quick discussion, I post it here. When I want to assign them a task, I post it here. The students can talk to me, but they can't send private messages to each other (thank goodness). It's the home base for all communication with my students.
My students are in front of laptops, so the uses are unlimited. If students don't have access during the day, it is a good place to hold discussions in off hours. Since it looks and feels like Facebook, the students are up and running immediately. I don't know what I did before I discovered this program.