UID smuggling: A new technique for tracking users online

Advertisers and web trackers have been able to aggregate users’ information across all of the websites they visit for decades, primarily by placing third-party cookies in users’ browsers. Two years ago, several browsers that prioritize user privacy began to block third-party cookies for all users by default. This presents a significant issue for businesses that place ads on the web on behalf of other companies and rely on cookies to track click-through rates to determine … More

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