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StackOverflow.com (SO) is a Question and Answer service oriented to support collaboration among developers in order to help them solving their issues related to software development. In SO, developers post questions related to a programming topic and other members of the site can provide answers to help them. The information available on this type of service is also known as "crowd knowledge" and currently is one important trend in supporting activities related to software development and maintenance.
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Souza et al. (2014) studied this question.