I know I see it a lot, and I don't really care for it, lol. Especially when you start seeing ads based on a physical conversation you had with someone.
There was a half dozen of us sitting around at a buddy's place one afternoon shooting the breeze. A few hours later after I got home I started getting ads on my phone and on my PC for things that we spoke about. No one did a search of any kind while we were there, we did all have our phones laying on the table though. After checking with a couple of the others, they were getting the same ads on their stuff.