Using the Web as a survey tool: results from the second WWW user survey
Proceedings of the Third International World-Wide Web conference on Technology, tools and applications
Emerging trends in the WWW user population
Communications of the ACM
The anatomy of a large-scale hypertextual Web search engine
WWW7 Proceedings of the seventh international conference on World Wide Web 7
Targeting audiences on the internet
Communications of the ACM
Telling humans and computers apart automatically
Communications of the ACM - Information cities
Labeling images with a computer game
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Studying cooperation and conflict between authors with history flow visualizations
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Identifying link farm spam pages
WWW '05 Special interest tracks and posters of the 14th international conference on World Wide Web
Becoming Wikipedian: transformation of participation in a collaborative online encyclopedia
GROUP '05 Proceedings of the 2005 international ACM SIGGROUP conference on Supporting group work
Improving accessibility of the web with a computer game
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Motivations of contributors to Wikipedia
ACM SIGCAS Computers and Society
Crowdsourcing user studies with Mechanical Turk
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Knowledge sharing and yahoo answers: everyone knows something
Proceedings of the 17th international conference on World Wide Web
On the evolution of the yahoo! answers QA community
Proceedings of the 31st annual international ACM SIGIR conference on Research and development in information retrieval
Identifying authoritative actors in question-answering forums: the case of Yahoo! answers
Proceedings of the 14th ACM SIGKDD international conference on Knowledge discovery and data mining
TurKit: tools for iterative tasks on mechanical Turk
Proceedings of the ACM SIGKDD Workshop on Human Computation
Technical engine for democratization of modeling, simulations, and predictions
Proceedings of the Winter Simulation Conference
Contributing to Wikipedia: Through Content or Social Interaction?
International Journal of Distributed Systems and Technologies
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Thousands of websites have been created to crowdsource tasks. In this paper, systems that crowdsource human-based computations are organized into four distinct classes using two factors: the users' motivation for completing the task (direct or indirect) and whether task completion is competitive. These classes are described and compared. Considerations and selection criteria for systems designers are presented. This investigation also identified several opportunities for further research. For example, existing systems might benefit from the integration of methods for transforming complex tasks into many simple tasks.