Raising the Stakes
I wonder if there is a mode where students can compete against each other. It would be cool if within the classrooms on Duolingo, students can get match to a formidable competitor. I usually teach in an asynchronous classroom, and this would be an ideal way to get students more into the language than they already are! :)
There is no specific mode, but people do like using the leaderboard for that (the students would have to "follow" each other. That way you can compare points. Were you thinking a different type of competition?