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I can't speak for other platforms, but if you've ever developed apps for iPhone, you'd know this is pretty much impossible for FB to do.

Doing this specific thing is quite easy, using public APIs, just by correlating data between signed in users.

I should be more clear: I'm referring to secretly recording audio.

Depends if you're sitting on a pile of exploits. Or just abusing loopholes to collect information from minors.

Is our memory really this short?