In mass open online courses, the majority of participants interact with video. The interaction of the learners with the videos is very important. Learner-content interactions are a major factor in completing courses. Work on the massive open online courses offered in Turkey who participated in the 3310 attendees, exhibitors, and content interaction behavior were investigated. Participatory behaviors; course registration dates, interaction dates, course start dates are examined under such categories. Content interactions were examined with the duration of the videos that the participants started and completed. In the study, it was found that videos with 3 minutes or less had less completion rate.