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What is XKeyscore, and can it 'eavesdrop on everyone, everywhere'? (+video)

XKeyscore is apparently a tool the NSA uses to sift through massive amounts of data. Critics say it allows the NSA to dip into people's 'most private thoughts' – a claim key lawmakers reject.

NSA collecting ‘nearly everything a user does on the internet’
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Top-secret documents leaked to The Guardian newspaper have set off a new round of debate over National Security Agency surveillance of electronic communications, with some cyber experts saying the trove reveals new and more dangerous means of digital snooping, while some members of Congress suggested that interpretation was incorrect.

The NSA's collection of "metadata" – basic call logs of phone numbers, time of the call, and duration of calls – is now well-known, with the Senate holding a hearing on the subject this week. But the tools discussed in the new Guardian documents apparently go beyond mere collection, allowing the agency to sift through the haystack of digital global communications to find the needle of terrorist activity.

The concern is that the capabilities could be misused or misdirected at innocents. In revealing the NSA metadata program, leaker Edward Snowden told the Guardian in June: "I, sitting at my desk, could wiretap anyone, from you or your accountant, to a federal judge or even the president, if I had a personal e-mail."

 
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