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Social, or Collaboratively Generated Content (CGC) is transforming how the authors seek and find information online: It is now a prominent part of the web information ecosystem, and a powerful platform for information seeking. The resulting archives of both the content and the context of the interactions contain valuable information that is often not available elsewhere, and can be helpful for the development of novel ranking algorithms, and natural language processing, text mining, and information retrieval techniques. They review machine learning techniques for modeling CGC, focusing on tasks such as learning to estimate content quality, relevance, and searcher intent and satisfaction with the retrieved results.
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