The discussion forum, currently the holy grail of "engagement" inside most online courses, is particularly problematic. Exchanges within forums are usually too strictly controlled and reduce honest interaction to busy-work scored by a rubric. These interactions rarely resemble the many and varied kinds of discussions possible in a classroom. And many teachers require things of online discussions that they would never demand in an on-ground classroom: one post of at least 250 words, properly cited, and exactly 2 responses to fellow students. Imagine trying to create a lively classroom discussion with these kinds of constraints.