Crowds and the wisdom of crowds

There’s a tube strike taking place in London today, and the BBC has put together a ‘crowd map’ showing disruption.  There’s a possibly unintentional ambiguity about this: is it a map highlighting where places in London are particularly crowded as a result of the strike, or is it a map drawing on its users (‘the crowd’) to contribute new information?  Either way, it’s an interesting idea although I think at present (just before the evening rush hour on the tube) it suffers because of the unevenness of the information that’s been provided about different parts of London.

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