We analyse the factors that determine the number of clicks on the "Like" button in online teaching videos, with a sample of teaching videos in the area of Microeconomics across Spanish-speaking countries. The results show that users prefer short online teaching videos. Moreover, some features of the videos have a significant impact on the number of "likes". We find that videos recorded by female teachers, and presented by entities other than universities are more likely to receive "Likes". Also, viewers prefer videos showing the teachers, along with slides and/or graphics tablets to those showing a recorded class.