A New York Times investigation has found that Facebook gave Netflix, Spotify and the Royal Bank of Canada (RBC) the ability to read, write and delete users’ private messages.
https://www.theguardian.com/commentisfree/2018/dec/21/quit-facebook-privacy-scandal-private-messages
https://www.theguardian.com/commentisfree/2018/dec/21/quit-facebook-privacy-scandal-private-messages