[dghughes]

What freaks me out is how invasive YouTube/Google is. I have browser ad blockers, script blockers, privacy addons. Sure I am logged in though which pretty much defeats the purpose of all those.

My often used example is the time I went car shopping with my sister. She was buying a new car I went with her (age old women vs salesman bias). The dealership was over an hour from my town, my sister lives in a different town. I didn't do anything other than stand there, no info of mine given, no forms filled out.

Back home two hours later YouTube has showing on recommendations for me videos for new car shopping.

[khyryk]

I'd guess location tracking (if you have an Android phone) with you stopped at a particular place for long enough.