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by alexnking 3964 days ago
This wasn't a security disclosure at all - Facebook knew that this information was available but didn't see it as a problem. The "problem" was that somebody tried to make the public aware of how it worked.

"Noticing a lack of significant public response to the visible nature of geo-location data on Facebook Messenger, despite media coverage dating back to 2012" - http://jots.pub/a/2015081101/