Crazy to see this posted today. Last night my wife and I were on a reservation in Arizona and watching the birds. She googled this very topic. Then when I looked at HN today, here it is! I showed it to her and the first thing out of her mouth was, “Is Facebook listening to me?” Then I had to explain that HN is human-powered and the chances of Big G and Facebook and HN sharing data is pretty close to zero.
Similar spooky things happen to me with online adverts. I happened to mention to a friend that I want to adopt a dog. Lo and behold, for the next 5 days, all I see is dog adoption/dog food adverts. It's happened twice to me, and both times, the ads have been so out of the ordinary from my usual ads, that I actually took time to notice them! I'm fairly certain Google is listening in to conversations for ad targeting.…
Do you know why you thought about adopting a dog randomly? Are you confusing cause and effect? Perhaps you were really being shown dog ads for six (or sixty) days and only noticed it for five.
I say this not to dismiss the fear of recording, but to raise that recording is kind of a lazy rationalization that tech companies probably favor over the other, more realistic explanation.
The idea that the ads have changed your behavior without you realizing is far more creepy. They don't have to listen to what you say because they influenced you to say it.