The technology has allowed the companies to monitor which sites their customers visit, cataloging their tastes and interests. Consumers cannot erase these supercookies or evade them by using browser settings, such as the “private” or “incognito” modes that are popular among users wary of corporate or government surveillance.
Verizon and AT&T say they have taken steps to alert their customers to the tracking and to protect customer privacy as the companies develop programs intended to help advertisers hone their pitches based on individual Internet behavior. But as word has spread about the supercookies in recent days, privacy advocates have reacted with alarm, saying the tracking could expose user Internet behavior to a wide range of outsiders — including intelligence services — and may also violate federal telecommunications and wiretapping laws.
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