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articles social systems, social search, social media, collective intelligence, wikinomics, crowd wisdom, smart mobs, mass collaboration, and human computation. The topic has been discussed extensively in books, popular press, and academia. 1, 5, 15, 23, 29, 35 But this body of work has considered mostly efforts in the physical world. 23, 29, 30 ome do consider crowdsourcing systems on the Web, but only certain system types 28, 33 or challenges (for example, how to evaluate users 12 ). Thisdoi:10.1145/1924421.1924442 fatcat:mat7zrvur5crfh4kfxffcwqooq