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A comment on Facebook Is Giving Advertisers Access To Your Shadow Contact Information. Parent comment

Re:Facebook Is Giving Advertisers Access To Your Shadow Cont... by r1ch on Thursday September 27, 2018 @09:25AM (#18084196)
I believe they used Wifi BSSID tracking for that, GPS would be too battery heavy. If you're connected to the same Wifi networks it can reasonably assume you're in the same vicinity.
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