https://www.cnbc.com/2017/10/30/facebook-denies-listening-to-user-conversations-via-microphones.html

A senior Facebook executive has denied the social network uses a device's microphone to listen in on real-life conversations in order to target people with relevant ads.

In response to a tweet on Friday by PJ Vogt, the presenter of a technology podcast called Reply All, Facebook's Vice President of Ads Rob Goldman said it was "just not true" the tech giant used this practice.