According to documents leaked by Edward Snowden, the NSA is collecting 5 billion records a day on mobile phone locations around the world. Some of those are from "incidentally" domestic, civilian mobile phones.
The Washington Post just published the details of the latest revelation, and the details are hair-raising indeed. The suite of tools the NSA's using is known as CO-TRAVELER, and it's capable of tracking cell phones even when they're not being used. The paper says, "In scale, scope and potential impact on privacy, the efforts to collect and analyse location data may be unsurpassed among the NSA surveillance programs that have been disclosed since June."
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