NSAは,1日に約50億件の携帯電話位置情報を収集している
下記の記事が出ている。
NSA tracking cellphone locations worldwide, Snowden documents show
Washington Post: December 5, 2013
http://www.washingtonpost.com/world/national-security/nsa-tracking-cellphone-locations-worldwide-snowden-documents-show/2013/12/04/5492873a-5cf2-11e3-bc56-c6ca94801fac_story.html
NSA collects nearly 5 billion cellphone location records per day
ars technica: December 5, 2013
http://arstechnica.com/tech-policy/2013/12/nsa-collects-nearly-5-billion-cellphone-location-records-per-day/
NSA 'tracking' hundreds of millions of mobile phones
BBC: 5 December, 2013
http://www.bbc.co.uk/news/technology-25231757
The NSA could figure out how many Americans it’s spying on. It just doesn’t want to.
Washington Post: December 4, 2013
http://www.washingtonpost.com/blogs/the-switch/wp/2013/12/04/the-nsa-could-figure-out-how-many-americans-its-spying-on-it-just-doesnt-want-to/
[追記:2013年12月11日]
関連記事を追加する。
New documents show how the NSA infers relationships based on mobile location data
Washington: December 10, 2013
http://www.washingtonpost.com/blogs/the-switch/wp/2013/12/10/new-documents-show-how-the-nsa-infers-relationships-based-on-mobile-location-data/
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