iOS: For reasons ranging from risqué to super-spy, you might occasionally want to send a secret image to somebody. While there are plenty of apps you can use to send disappearing images, Cammeleon is a cool little iOS app that lets you hide images within images.
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This week, it was reported that fitness app Strava had published data that allowed ordinary citizens to determine the locations of secret military installations around the world. Strava publishes heatmaps showing the most popular running and cycling routes used by professional and amateur athletes who use their platform. A uni student looked at the heat maps in several conflict zones and was able to ascertain the locations of military bases from his observations. But the blame isn't with Strava - the personnel involved are the problem.