How open-source intelligence fans track down clues in a photo
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Each month, our journalists go meet an Observer to take a closer look at events they have witnessed.
Every day, the Twitter account @Quiztime posts a photo and asks its followers to identify where it was taken. Fans use clues like a license plate or a car GPS to track down the photo. The game is an example of open-source intelligence, or OSINT, which uses publicly available sources to gather information.
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