Facebook ‘Marauder’s Map’ turns Messenger into a stalker’s dream

You’re no doubt aware that Facebook shares your location with friends, but what you probably didn’t realize is how precise that data is or how easy it is to extract from the service. Aran Khanna, a student developer in Cambridge, MA, has created a Chrome extension that grabs location data from Facebook Messenger and rapidly plots your friends’ locations on a map. Named ‘Marauder’s Map’, in a cheeky nod to Harry Potter, the extension loads the map in Messenger’s Web interface. The data is retrieved from messages sent with location sharing enabled. That usually means from mobile devices, as it’s…

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