Every few months there is some verified news about Facebook eavesdropping. Usually it is not something that we could consider relevant. Sources of such news are most likely to be anti-everything only pro Jesus.
However, for past few weeks there was one news that made a sense. Whole theory got a powers and people are interested whether Facebook is listening to their phone or video calls in targeting their ads. Universally, I believe that Facebook is listening. Everything you do on Facebook is gathered and reused for personalized ads. Nevertheless, Facebook had to make one of the famous sincere statements we are not eavesdropping you. Believe what you want but it could be nice if they told the truth.