>>you would need to have Facebook open, and mic access at all times set
Facebook by default runs in the background and has access to the microphone (Messenger calls).
Keeping it on all the time though is a bit of a stretch though, I agree. Firstly it would have been spotted by now and secondly it'd knacker the battery.
I expect what it does do though is notice our common location and show one person adverts connected to the other person's recent searches.
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