Harvard student Aran Khanna built a Chrome extension called “Marauder’s Map” that uses location data contained in interactions through Facebook’s Messenger app to determine users’ whereabouts within a meter, reports Wired. Khanna explained how he found an acquaintance’s dorm room by “looking at the cluster of messages sent late at night.” He then realized he could also locate users he was not friends with but were part of a certain group chat. Facebook asked Khanna to take down the app, which he did, though he uploaded the code to Github—while also directing readers to a page on protecting their privacy. Facebook promptly launched an update to Messenger and has revoked Khanna’s internship at the company.
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