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Successful Social web sites keep users engaged. One popular engagement feature is Questions and Answers (Q&A), where users can ask questions and experts (or any user) can answer. Qhub(http://www.qhub.com/), a service that allows you to setup a Q&A section on your site has pushed the envelope by releasing its Qhub API that could enhance your Q&A offering in your application and increase its reach via applications.