Startup Idea : Social Media Peer to Peer Higher Education Network

I know the concept isn't entirely new but I feel it needs to be broadened and bettered. Problem: Tertiary education in the United States is increasingly unaffordable and the paradigm shift from traditional higher education is starting to unfold quickly amongst seekers of higher education and those who employ them. This is Education for the information age. A raw idea but simply: A place for Students (any individual with a desire to learn about something be it specific, broad scope etc.) to come and based on credentials and peer review, choose the subject, teacher, style of learning (individual, Virtual class/group etc) and learn a structured curriculum from teachers (anyone with the experience, credentials and ability to administer and facilitate a structured approach to teaching others) from around the globe. Obviously this is very vague and I am sure that questions would popup everywhere, but I do have some answers and I'm diligently working towards something that outlines the basic fundamental ideas of the site.