In this keynote we focus on the concept of wisdom of crowds in the context of the Web, particularly through social media and web search usage. As expected from Zipf's principle of least effort, the wisdom is heterogeneous and biased to active people, which represent at the end the wisdom of a few. We also explore the impact on the wisdom of crowds of dimensions such as bias, privacy, scalability, and spam. We also cover related concepts such as the long tail of the special interests of people, or the digital desert, web content that nobody sees.
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