Why ads for the product you just bought in the real world appear when you're online

[osewalrus]

 through using a store's free wifi or app, they can track you in their physical store via your phone. 
https://www.vox.com/recode/2019/12/19/21011527/retail-tracking-apps-wifi-bluetooth-facebook-ads

Comments

[vettecat]

Good to know, thanks for the alert. (Though I never do either, still important to be aware.)