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Google Maps is a huge vector most people don't think about.

• pftburger 6y ago
  Seconded. Visited the dentist recently. On my way I looked up directions in google maps, then for a week had dental insurance adds. This one is obvious though. That was on iOS with it’s pretty strict location tracking rules etc. I’d be interested to see if you can get it to show you adds just by visiting the dentist (and not searching) on a vanilla android phone (IE google’s location history on by default)