NSA is limited to communications with at least one outside the US
Stray 13 Jonathan Stray, Special to ProPublica, Aug. 5, 2013, 3:20 p.m. FAQ: What You Need to Know About the NSA’s Surveillance Programs http://www.propublica.org/article/nsa-data-collection-faq
Massive amounts of raw Internet traffic The NSA intercepts huge amounts of raw data, and stores billions of communication records per day in its databases. Using the NSA’s XKEYSCORE software, analysts can see “nearly everything a user does on the Internet” including emails, social media posts, web sites you visit, addresses typed into Google Maps, files sent, and more. Currently the NSA is only authorized to intercept Internet communications with at least one end outside the U.S., though the domestic collection program used to be broader. But because there is no fully reliable automatic way to separate domestic from international communications, this program also captures some amount of U.S. citizens’ purely domestic Internet activity, such as emails, social media posts, instant messages, the sites you visit and online purchases you make.
The contents of an unknown number of phone calls There have been several reports that the NSA records the audio contents of some phone calls and a leaked document confirms this. This reportedly happens “on a much smaller scale” than the programs above, after analysts select specific people as “targets.” Calls to or from U.S. phone numbers can be recorded, as long as the other end is outside the U.S. or one of the callers is involved in "international terrorism". There does not seem to be any public information about the collection of text messages, which would be much more practical to collect in bulk because of their smaller size.
The NSA has been prohibited from recording domestic communications since the passage of the Foreign Intelligence Surveillance Act but at least two of these programs -- phone records collection and Internet cable taps -- involve huge volumes of Americans’ data.
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