Two Harvard University students analyzed images Exif metadata included in the photos used by crooks to advertise their products on black marketplaces in the dark web. The researchers found 229 unique images that contained geolocation data that would reference the location of the shot within a range of two kilometres. The data was collected from 2013 to 2015, totalling 44 million files or 1.5Tb of data. Most popular black market websites are failing to remove metadata from images published in the study. In the case of Agora, the researchers noticed that EXIF metadata was absent on March 18.”]
Source: http://securityaffairs.co/wordpress/51418/deep-web/exif-metadata-darkweb.html