Emerging online teaching platforms (like MOOCs) count millions of members, however course completion rates rarely break 10%. Many are completely free and open, while premium services (that may offer certificates of completion) still allow free class-auditing. Some platforms (like Udacity) are mostly geared toward teaching in-demand tech skills, while others are more broad, engaging the entirety of academia. Clearly such frameworks can be successful, we just don’t know best practices yet.