Gil Weiss and Ben Horne
Credit: Karel Navarro / AP

Crowdsourcing had its first notable success in July 2012. U.S. climbers Gil Weiss and Ben Horne went missing on Mt. Palcaraju in the Cordillera Blanca range of Peru. While the conventional ground search was underway, friends back home who ran Tomnod (a crowdsourcing platform originally developed to search for Genghis Khan's tomb) decided to try a high-tech search. Using satellite images from DigitalGlobe's WorldView-2, hundreds of volunteers tagged 2,421 clues – which soon highlighted the climbers' trail up the mountain. From the tags, Tomnod was able to amass enough data to offer ground searchers three locations where the men might be. They were successful in finding the bodies of the men near one of the locations.