After all, it’s not hard to extrapolate from big pools of data, especially location data, such things as when your friend last vacationed, or the likely home of a former romantic partner. Switching it off isn’t exactly arduous - you need only jump settings and uncheck the box next to ‘Location’ - but given the opaqueness of the process, the potential for unintentional sharing is all too apparent.Ĭoncededly, extensions like “Marauder’s Map” are little more than a voyeuristic curiosity - all whereabouts are approximate and reported only as messages are received - but they do illustrate the dangers of liberal sharing. Location sharing is an optional feature, but it’s easy to leave it enabled unwittingly - at no point during the Messenger app setup process are users informed that location tracking is turned on by default. “Marauder’s Map” pulls that data from Javascript objects in the Messenger web client and presents it as dots and lines over a geographical map.
It works like this: if your friends use Messenger on mobile and have opted in to location sharing, their coarse latitude and longitude is recorded with every reply and text they send. The Chrome extension, dubbed “Marauder’s Map” in a tongue-in-cheek nod to Harry Potter, harvests your friends’ location data to map a history of their movements over time. That sadly isn’t the case - a new browser tool developed by a Cambridge, MA student reveals that Messenger, if left configured on the default setting, can be quite invasive.
Fitbit Versa 3īusiness InsiderIt’s probably naive to expect even the tiniest measure of privacy in an age of pervasive surveillance, but you could be forgiven if you thought Facebook Messenger was a source of respite.