I'm thinking of an idea of a social networking education website. Many online educational projects such as Youtube EDU, iTunes U or Academic Earth have great content but lack social networking features. I believe the "social" part is very important in the process of learning things when you can interact with classmates and instructors, ask questions and get answers. So that not only you can browse and watch education materials, but also the community will play an important role in the learning process.
Do you know any websites that already offer these features?
There are good examples of the execution of this idea for particular areas like italki.com for english learning or www.jamplay.com for guitar playing. But I'm thinking bigger, so it'd be for fundamental university disciplines like computer science or mathematics.
I don't want to build another useless social network, I'm more on the way to research what is already available, how existent solutions can be enhanced.