Tom Billings
Credit: AP

When British tourist Tom Billings disappeared in Vancouver, B.C. in November 2013 he left few clues. With the suggestion he may have headed off hiking alone in the North Shore mountains, North Shore Rescue, with financial assistance from the Billings family, used a helicopter to record high-quality video of the area and posted it on YouTube with a request for members of the public to search it for signs. Doug Pope from NSR says the video generated a great response: "Hours of film have since been reviewed – something the volunteer staff just doesn't have time to do." While Billings is still missing, Pope says they did get credible information, and they will use crowdsourcing again.