@rrhoover the chat is the main driver. It's slightly unfortunate it got hunted already because of some work I'm doing on the chat, but that's the part that makes it stand out from 'MOOCs'.
The problem with MOOCs is that you feel lonely, watching a bunch of videos and then never finishing your course. With Classroom.fm I'm trying to take the social campus experience and blend it with online video so, just like in real life, you can ignore the professors and spend most of your time chatting with your classmates and make new friends.
Besides chat, I'll be adding categories for specific subjects so you can watch and learn with likeminded people.