Coming on the heels of the recently launched Microsoft MapCruncher, WikiMapia uses the Google Maps API and a Wiki interface. This enables users to enter or edit information with map hotspots. They ask that you refrain from adding anything that wouldn't be useful to everyone. Currently, the entries mainly consist of empty hotspots on buildings of interest, but a UK PacMan was also spotted. The search functionality only works searching tags applied to entries. There just aren't enough entries yet. I searched [cropcircle] from the main screen, and it limited the hotspots to the single entry with that tag. If WikiMapia gets populated, the search would obviously become more elaborate.
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