https://www.theverge.com/2018/4/10/17221478/zuckerberg-facebook-senate-listening-tapping-microphone

Suspicions that Facebook (and associated apps like Instagram) are secretly recording audio through phone microphones in order to better target ads have refused to die, despite official denials dating all the way back to 2016. In today’s Senate hearing, Mark Zuckerberg addressed the urban legend yet again, issuing an absolute denial.

“Yes or no, does Facebook use audio obtained from mobile devices to enrich personal information about users?” asked Sen. Gary Peters (D-MI).