Russell Brandom, writing for The Verge:

Verizon and AT&T will tell you they just want to help serve you more relevant ads, which isn’t so bad on the face of it — but we’ve seen networks like this used for much more questionable ends, most notably when the NSA took over Google’s cookie-tracking network to help target malware injections. Tracking is tracking, and it’s hard to tell what else might be built on top of the network once it’s in use. For Verizon and AT&T customers — which, put together, compose a little more than two-thirds of US citizens — the result is a comprehensive surveillance system that they didn’t approve and, until this month, were largely unaware of.

Gross.