Massive Open Online Courses (MOOCs) are big news in higher education at the moment, with hundreds of the world's leading universities offering free access to lectures and other resources. Many MOOC providers operate through platforms such as edX, a not-for-profit consortium formed by MIT, Harvard and Berkeley, or commercially oriented platforms such as Udacity and Coursera. The last two provide the courses free, but aim to make money by charging for certification, or by making data on MOOC graduates available to recruiters. And the numbers involved are huge: MOOCs can attract tens of thousands, even hundreds of thousands, of enrolments.