https://www.wired.com/story/track-location-with-mobile-ads-1000-dollars-study/amp https://www.wired.com/story/track-location-with-mobile-ads-1... Basic summary

https://www.wired.com/story/track-location-with-mobile-ads-1000-dollars-study/amp https://www.wired.com/story/track-location-with-mobile-ads-1... Basic summary trawl someone’s social media. Get a small handful of their least common interests. Run an ad that only hits a dozen or so people in even a metropolitan area. This is something that is cheap enough that private investigators and legal firms looking for dirt on a target will do so.