Re:Facebook Data Collected by Quiz App Included Private Mess...
by simcop2387 on Tuesday April 10, 2018 @08:53PM
(#16807143)
You used to be able to connect to facebook messenger via XMPP. Combined with this permission, it would have let you retrieve historical messages and add persistence among alternative clients.
https://news.ycombinator.com/item?id=9266769