The XKeyscore documents say the program is the NSA's "widest reaching" system developing intelligence from computer networks. NSA/Edward Snowden National Security Agency documents provided to The Guardian by Edward Snowden reveal a system that, as of 2008, allowed analysts to search "nearly everything a typical user does on the internet," according to one document.

Glenn Greenwald reports that training materials for a program called XKeyscore show how analysts — without the review of a court or other NSA personnel — can mine extensive agency databases by giving only a broad justification for the search.

"It's very rare to be questioned on our searches," Snowden told the Guardian in June, "and even when we are, it's usually along the lines of: 'let's bulk up the justification.'"

From Greenwald:

XKeyscore provides the technological capability, if not the legal authority, to target even US persons for extensive electronic surveillance without a warrant provided that some identifying information, such as their email or IP address, is known to the analyst.

Furthermore, Greenwald reports that analysts can use XKeyscore and other systems "to obtain ongoing 'real-time' interception of an individual's internet activity."

This would be akin to the NSA's assertion, as stated in 2000, that the "NSA must 'live on the network'" to "perform both its offensive and defensive mission."

The Guardian has published the NSA training slides from the program, which are from 2008. One shows how XKeyscore constantly collects digital activity and that an analyst can search the s well as the content of emails, social media use, internet browsing activity, and more.

One NSA report from 2007 estimated that 1-2 billion "call events" and internet records were added every day. NSA via Edward Snowden Greenwald reports that analysts "can also search by name, telephone number, IP address, keywords, the language in which the internet activity was conducted or the type of browser used."

The documents state 300 terrorists had been captured using intelligence from XKeyscore as of 2008.

In regards to emails, one top-secret document provided by Snowden describes how an analyst can plug an email address into the program and XKeyscore "searches within bodies of emails, webpages and documents," including the "To, From, CC, BCC lines" and the 'Contact Us' pages on websites."

As is clear by now, these databases include "communications that transit the United States and communications that terminate in the United States," as one NSA document notes.

Greenwald presents several slides and reports that an NSA analyst can " begin surveillance on anyone by clicking a few simple pull-down menus," noting that an NSA tool called DNI Presenter enables an analyst to "read the content of Facebook chats or private messages."

Ryan Gallagher of Slate points out that since the slides are from 2008, the NSA may not currently have the access that Greenwald implies because of "https" encryption:

Some XKeyscore slides are from '08 & outdated as don't account for how Facebook, Google, etc have since broadened HTTPS implementation. #NSA — Ryan Gallagher (@rj_gallagher) July 31, 2013

Facebook, for instance, rolled out https for all users in 2012.

Furthermore, Sen. Ron Wyden said that the bulk Internet collection program was shut down in 2011.

Nevertheless, the new NSA documents corroborate what Snowden told the Guardian in June:

"I, sitting at my desk, certainly had the authorities to wiretap anyone, from you, or your accountant, to a federal judge or even the president, if I had a personal email," Snowden said in a video interview.

Greenwald notes that Mike Rogers, the Republican chairman of the House intelligence committee, responded by saying: "He's lying. It's impossible for him to do what he was saying he could do."

Based on the XKeyscore training documents, an analyst could do that and much more.