N.S.A. Gathers Data on Social Connections of U.S. Citizens - NYTimes.com
The spy agency began allowing the analysis of phone call and e-mail logs in November 2010 to examine Americans’ networks of associations for foreign intelligence purposes after N.S.A. officials lifted restrictions on the practice, according to documents provided by Edward J. Snowden, the former N.S.A. contractor.


 http://nyti.ms/18CnyiZ

Source: http://www.nytimes.com/2013/09/29/us/nsa-examines-social-networks-of-us-citizens.html?pagewanted=1&_r=0
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