Zuckerberg confirms: Facebook does not spy on you through your microphone - https://mspu.co/2JBxS2f pic.twitter.com/BGI8W6C4MF
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Zuck made it sound like the only audio data captured was from camera services. Regardless, he did plainly state that they do in fact delete all data they have for you if you properly delete your Facebook account.
“Made it sound like” 
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