Here are some annotated slides from a presentation I gave at our Technology for Learning research network.
Some useful research papers on this topic:
Knox, Jeremy (2014) Digital culture clash: “massive” education in the E-learning and Digital Cultures MOOC, Distance Education, 35:2, 164-177.
O’Toole, Robert (2013) Pedagogical strategies and technologies for peer assessment in Massively Open Online Courses (MOOCs). Discussion Paper. University of Warwick, Coventry, UK.