https://www.theregister.co.uk/2019/08/14/facebook_messenger_conversations/ > Facebook secretly employed hundreds of contractors to listen to clips of its addicts' private voice calls to transcribe parts of conversations its AI software couldn't understand. > Basically, if you allowed Facebook Messenger to automatically transcribe your voice calls, and the antisocial network's machine-learning code couldn't work out what you said during your nattering, an audio clip of your voice would be shared with a human to listen to and figure out what was said, according to Bloomberg on Tuesday.