I too am struggling to understand. The key sentence seems to be: > These details along with someone's IP address - the unique identifier used by internet devi

I too am struggling to understand. The key sentence seems to be: > These details along with someone's IP address - the unique identifier used by internet devices - were previously prohibited by Google for ad targeting. I don't understand how fingerprinting can be used for ad targeting, however? Fingerprinting is used to build a profile, and you've always been able to target profile categories. Is this about targeting specific previous visitors to your website? This article presents absolutely zero information about anything that has actually changed. It says: > Changes which come in on Sunday permit so-called "fingerprinting" But fingerprinting isn't something that is permitted or not. It just exists. It can't be stopped on the modern web. If anyone knows what concrete change Google made that supposedly takes place today, it would be great to know.