Quizz: targeted crowdsourcing with a billion (potential) users

@article{Ipeirotis2014QuizzTC,
  title={Quizz: targeted crowdsourcing with a billion (potential) users},
  author={Panagiotis G. Ipeirotis and Evgeniy Gabrilovich},
  journal={Proceedings of the 23rd international conference on World wide web},
  year={2014}
}
We describe Quizz, a gamified crowdsourcing system that simultaneously assesses the knowledge of users and acquires new knowledge from them. Quizz operates by asking users to complete short quizzes on specific topics; as a user answers the quiz questions, Quizz estimates the user's competence. To acquire new knowledge, Quizz also incorporates questions for which we do not have a known answer; the answers given by competent users provide useful signals for selecting the correct answers for these… 

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