I am looking for a free online (Q & A) platform service for using in my math classes which permits the students to ask their questions, and supports Mathjax/Latex like on Mathoverflow/Math.SE/Matheducators and its platform resembles to that of stackexchange websites.
I already know the service piazza but its platform is not as user-friendly as that of stackexchange websites. If there is not such a service, suggesting any other alternative would be helpful.