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Piazza is a free Q&A social learning platform for iOS. Described as "mixture between a wiki and a forum," it can be used with learning management systems. Developed specifically for higher education, it's commonly used in many college courses for centralized class communications and polling.
If you're a student, the Piazza app lets you ask and answer questions in all your Piazza classes from your iPhone and iPad, and updates you in real time when your peers are engaged. And if you're an instructor, the app gives you a simple way to check in on your students.