Should a Teaching Article Have a Comment Section? Evidence on Forum Participation, Reputation Systems, Study Groups, and Q&A Communities
MOOC learners who posted in the forum passed at much higher rates than those who did not (57% vs 8% in one course), but the authors themselves call this a correlation under self-selection. Randomly adding a reputation system made replies more numerous and faster, with no difference detected in grades; an instructor replying actively versus not at all showed no difference in completion or engagement. No study has tested what a blog comment section does for readers' learning.