I don’t use FB or Twitter either. So it was a surprise when I began seeing ads targeted to me. It could only have been from my search engine history. And that would be Google.
I don’t know if any other engines do that or not.
Same here and yes google does that. Targeted advertising by google doesn't bother me when I've specifically looked for similar items recently. There is a long way on the continuum from targeted ads to tracking what you express as opinions. Personally I would never have amazon's Alexa in my house, by definition those things listen to you all the time and constantly send what they hear to Amazon's servers to what end we can only guess.