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Namesake, is a tool for real-time and asynchronous conversations.  It's a bit like Quora but more focused on conversation as compared to Q&A and it allows real-time conversation a bit like twitter. 

"Welcome to Piazza-a place where students can come together to ask, answer, and explore under the guidance of their instructor. It'll save you time, and your students will love using it. It's also free, and easy to get started."