

I tested this with my Facebook app in 2013. Found a Spanish radio station, set my phone down next to it overnight, and for several weeks I was seeing ads exclusively in Spanish. Deleted the app the first day I saw them in Spanish, and deleted my account not long after that.
My wife still uses them after 5 years together and me pointing out all the times it’s obviously eavesdropping on us, and she’s even been creeped out by it before. Still uses it…
Unless my microphone and camera have physical switches, I will assume they are being used. Those little “your camera and microphone are off” icons in the corner of the screen don’t reassure me.
It was a stereo from 1987.
Ye Olde Analog airwaves, no fancy digital nonsense.