Cleared your browser cookies? It won’t stop ad company using Verizon tracking header

A company that correlates data about users across different websites to share with marketers is using unique IDs inserted by Verizon into mobile Web traffic to recreate tracking cookies that have been deleted by users.

The story began a few months ago when it was reported that both Verizon and AT&T were injecting unique identifiers in the Web requests of their mobile customers. Privacy activists criticized the practice because it creates so-called perma-cookies (permanent cookies) that cannot be deleted by users as they’re added en-route, at the carrier level.

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