A map of geo-tagged data in Chicago shows a heavy concentration of tweets, Flickr, and Wikipedia. There are also a a large number of Foursquares.
Tokyo Japan. Not surprising that the people of Japan have a lot of Flickr posts, they are famous for their love of photography.
But the service that provides the richest web data is Wikipedia which provides rich geo-tagged data for amost all the major features of human civilization.
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