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Small-Scale Question Sunday for December 7, 2025

Do you have a dumb question that you're kind of embarrassed to ask in the main thread? Is there something you're just not sure about?

This is your opportunity to ask questions. No question too simple or too silly.

Culture war topics are accepted, and proposals for a better intro post are appreciated.

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By now that claim about smartphones passively listening in 24/7 for ad targeting is quite old. Any conclusive evidence either for or against?

Modern operating systems inform you when the microphone is on. This claim requires that Facebook et al have a backdoor that's never been detected in all these years.

The FB pixel localhost sidechannel exfiltration got caught within a year or so, but the researchers that found it realized that Yandex had been using a similar technique for 7 years without getting caught.

That was a clever use of Internet permissions, which were requested by the apps, rather than a covert usage of permissions that the apps weren't supposed to have. There's a difference between using a permission creatively and using a permission that you're not supposed to have.

Does this difference actually matter? 99.99% of users will click "allow" on any permission a "trusted" app (like facebook or browser) would ask them for, and would never realize any of those deep technical aspects.

If you've got a green microphone chip in your notifications bar because Facebook is listening to you, then it's not really a mystery if Facebook is listening to you or not and this conversation would be over.

However, this doesn't happen and nobody has produced an explanation of how it could happen without the OS notifying the user that the microphone is enabled.

Nobody checks any notifications bars when your phone is in your pocket or sitting on your table. A tiny green dot is hard to miss. Also, I am not entirely convinced there's no way to turn on the microphone (hardware) without showing the green dot (software). It's be very easy to lay all these doubt to rest - make a hardware microphone mute switch, that physically (electrically) disconnects the microphone hardware. I'd trust that. Nobody does it though.

Why would you trust the Phone OS to set the electronic switch off (a physical switch isn't possible) if you don't trust the same OS to not route audio to the app without your permission?