Verizon says it will soon offer customers a way to opt out from having their smartphone and tablet browsing tracked via a hidden un-killable tracking identifier.
The decision came after a ProPublica article revealed that an online advertiser, Turn, was exploiting the Verizon identifier to respawn tracking cookies that users had deleted.
Two days after the article appeared, Turn said it would suspend the practice of creating so-called “zombie cookies” that couldn’t be deleted. But Verizon couldn’t assure users that other companies might not also exploit the number—which was transmitted automatically to any website or app a user visited from a Verizon-enabled device—to build dossiers about people’s behavior on their mobile devices.
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