Assuming they're honest here, is it possible it's other apps tapping the microphone, correlating it with your Facebook account, and somehow placing items in you

Assuming they're honest here, is it possible it's other apps tapping the microphone, correlating it with your Facebook account, and somehow placing items in your newsfeed/etc.? I'm not familiar with the capabilities of FB ad platform to know if this is feasible. Otherwise, like someone else here said, it's probably contracted out to a third-party doing the mic listening.