I set up an Edmodo account ( http://edmodo.com/pole). I think that it will be a good way to communicate with students and teachers and get feedback from them. Videos, links, and assignments can be inserted in Edmodo for all groups. This website will help students to pinpoint the concepts that they need to study and to locate the resources needed to study.
I set up also a Poll Everywhere account, the student can use their cell phone, IPads/netbooks to give immediate responses to a set of questions. This is another way to get feedback from all students (total response system).