Ah yes, the “Play-Doh” experiment from 2015 is proven true. (In 2015 we had to get an Android phone for testing and had to install Facebook. Out of curiosity we blurted the word “Play-Doh” every few hours with no context. A day later ads for Play-Doh and other kids toys started appearing on The Facebook page. It was immediately deleted from the Android phone)

https://www.tweaktown.com/news/100282/facebook-partner-admits-smartphone-microphones-listen-to-people-talk-serve-better-ads/index.html