Jacob Hoffman-Andrews writes:
Verizon advertising partner Turn has been caught using Verizon Wireless’s UIDH tracking header to resurrect deleted tracking cookies and share them with dozens of major websites and ad networks, forming a vast web of non-consensual online tracking. Explosive research from Stanford security expert Jonathan Mayer shows that, as we warned in November, Verizon’s UIDH header is being used as an undeletable perma-cookie that makes it impossible for customers to meaningfully control their online privacy.
Read more on EFF.