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You should be, the Facebook app explicitly does listen to the mic unless you opt out. It has also come out that Google and Amazon are storing people's personal voice requests, and aside from that the mics are always on waiting to hear the trigger words. This means by default that the apps are listening and analyzing everything, though how much of the non word-triggered speech gets recorded is unknown. Facebook's init…
The Facebook app, on iPhone at least, requires you to opt in to giving it microphone access. I've seen the myth that Facebook is targeting ads based on what it hears debunked several times. Do you have a source that shows that it is in fact listening? I think it's more likely that the same reason someone is talking about something (they're in a demographic interested in that thing) is the reason that Facebook gives y…
Thinking about it, I might just remove it from Google as well since I don't really use voice search.