In the on-going quest for improved learning in large-class settings, an active-learning approach for an introductory physics course yielded mixed results, according to a new report from the Higher Education Quality Council of Ontario. Evaluating the Effectiveness of Modified Peer Instruction in Large Introductory Physics Classes examined the use of collaborative, multiple-choice format question (MCFQ)-writing activities for students as a supplement to standard peer instruction methods.
Quora easily allows you or your students to find questions that have already been posed (that is, by individuals who might or might not have any connection to your course). More than likely, responses to those questions will have already been contributed.