Somebody's Already Using Verizon's ID to Track Users [telecom]

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Twitter is using a newly discovered hidden code that the telecom carriers are adding to every page you visit - and it's very hard to opt out.

Twitter's mobile advertising arm enables its clients to use a hidden, undeletable tracking number created by Verizon to track user behavior on smartphones and tablets.

Wired and Forbes reported earlier this week that the two largest cellphone carriers in the United States, Verizon and AT&T, are adding the tracking number to their subscribers' Internet activity, even when users opt out.

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