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

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Rep. Mike Rogers (R) of Michigan, chairman of the House intelligence committee, rejected that claim. “It's impossible for him to do what he was saying he could do."

But the new Guardian leak appears to indicate something at least close to such capability. The program, called XKeyscore, is the “widest-reaching” Internet surveillance system, according to one of several analyst “training” documents, which included a 32-slide presentation leaked to The Guardian. An analyst has to enter only an individual e-mail address – along with a “justification” inserted into another field on the screen – to get a trove of personal e-mail sorted by time period, say analysts who reviewed the slides for the Monitor.

The program can also apparently determine which computers visited a website and when, as well as searching chats, usernames, buddy lists, and cookies. One slide in an XKeyscore document features corporate logos of a number of familiar online social media companies, saying the program lets analysts see “nearly everything a typical user does on the Internet.”

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