This week saw an outpouring of social media posts decrying forest fires in the Amazon rainforest, many of them under the hashtag #PrayforAmazonas. But some of the most viral posts are misleading, including either photographs of the Amazon that are years old or images taken in other parts of the world. Using a reverse image search, a simple tool to check when a photo first appeared online, we’ve been able to trace the origins of some of the pictures being shared out-of-context.