// The Verge - All Posts
Last week, privacy advocates turned up some unsettling news: for two years, Verizon's Precision Insights division has been seeding web requests with unique identifiers. If you visited a website from a Verizon phone, there's a good chance the carrier injected a special tag into the data sent from you phone, telling the website exactly who you were and where you were coming from, all without alerting customers or informing the public at large. Today, Forbes' Kashmir Hill reports that AT&T is testing a similar program, although it may be possible to opt out. In both cases, the message is clear: there's a lucrative business in tracking users across the web, and carriers want in on it.