Facebook revoked an internship offer to a Harvard student after he launched a controversial Chrome extension that showed your Facebook friends’ location down to the nearest meter.

Marauder’s Map, named after a magical location-tracking map in J.K. Rowling’s Harry Potter books, highlighted where your friends were, provided those friends also used Messenger on their phones. At that point, Messenger automatically shared users’ locations with anyone they messaged

For the few days in May when it worked, Marauder’s Map was a Facebook stalker’s dream. When I used it, I could track a friend who was in Palo Alto for meetings down to the exact building. Read more…

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Facebook revoked internship for student who made ‘Marauder’s Map’