Explosive growth. Means the number of courses is still rising. And it’s doing so daily. From January 21 to January 27, the number of MOOCs listed on Class Central grew at a rate of greater than 15 courses per day. Of course, at the start of a new year and new semester, course offerings are going to spike. But this kind of growth, like that associated with Coursera, is “faster than Facebook,” specifically in terms of having a user growth rate greater than 2,000%. That’s growth from roughly 160,000 learners at one university in 2011 to 35,000,000 learners at 570 universities and twelve providers in 2015.