From Business Wire:
"The number of worldwide WiFi Hotspots has surpassed the 50,000 milestone according to recent numbers released by JiWire, the leading provider of WiFi content and Hotspot information (www.jiwire.com). A Hotspot is a physical address where people can connect to a public wireless network, such as a cafe, hotel or airport.
In addition, London tops JiWire's list of WiFi-friendly cities for having the greatest number of Hotspot locations, followed by Tokyo and New York. For a full listing of the Top Ten Hotspot Cities and Top Ten Countries, go to (http://www.jiwire.com/search-hotspot-locations.htm)."