Mainstackr seeks to populate video content with valuable discourse between students and University content publishers. To accomplish this, our application allows students to pinpoint moments of a video, and post their question/comment to an activity feed. Other students can then click the post and be brought to that moment to help contribute to the discussion. If a student feels confused or appreciates a certain moment, they can tag their feelings. Tags may accumulate on certain moments and other students can visualize this under the video player. Students can then resolve the accumulation in that moment of the video and receive reputation points.