I can see this to be helpful if you are doing something really creative in class and the students could send photos of what they are doing. It would then go to their friends and create more interest for the students to take the class. Our marketing dept. at our school does this but I'm not sure they use Instragram. I think it would be much more effective as a marketing tool becuase students get recommendations from other students on what classes to take. I'm following my son and a friend of mine at this time. I really need to explore it much more to see what others I would like to follow.