My Take
I believe that Duolingo is an extremely beneficial teaching tool due to the fact that it is simple and it provides a lot of different resources to not only the students but the teachers as well. It is really engaging and allows the students to really interact with the application. It seems most students really enjoy using this because it's able to be done at their own level and pace.
How I Use It
I used this teaching/learning tool to introduce new languages and even more profound English to the students. There are little setup trial and error questions and prompts they have for students to complete.