evidence: Other researchers soon followed up with a dizzying array of international examples, based on cross-referencing Strava user activity with Google Maps and prior news reporting: a French military base in Niger, an Italian military base in Djibouti, and even CIA "black" sites. Several experts observed that the Strava heatmap seemed best at revealing the presence of mostly Western military and civilian operations in developing countries. Many locations of military and intelligence agency bases pointed out by researchers and journalists had already been previously revealed through other public sources. But the bigger worry from an operations security standpoint was how Strava’s activity data could be used to identify interesting individuals, and track them to other sensitive or secretive locations. Paul Dietrich, a researcher and activist, claimed to have used public data scraped from Strava’s website to track a French soldier from overseas deployment all the way back home. [...] Strava’s data could even be used to follow individuals of interest as they rotated among military bases or intelligence community locations, according to Jeffrey Lewis, director of the East Asia Nonproliferation Program in the Middlebury Institute of International Studies at Monterey, California. In a sobering Daily Beast article, Lewis laid out a scenario by which Chinese analysts could track a Taiwanese soldier based on his activities at a known missile base and thereby discover other previously unknown missile bases as the soldier’s duties required him to rotate through those bases.