Remember the magical Marauder’s Map from the Harry Potter books that reveal the whereabouts of characters as they roam classrooms and the halls of Hogwarts school? A student developer from Cambridge has created a Chrome extension that works similar and also named it Marauder’s Map. The extension that allows you to watch every footstep of your Facebook friends by grabbing location data from Facebook Messenger and rapidly plotting your friends’ locations on a map.
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