Advertising by listening to the microphone

Hey Guys, a quick question:

A Facebook group would discuss the topic "Advertising by listening to the microphone". Users report that they talked about a topic near their smartphone and shortly afterwards received advertising about this topic on e.g. Facebook without having searched it beforehand, e.g. on Google. How could that be? Can Facebook permanently listen in on the microphone and display personalized ads?

Excuse my English, it's not so good.

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