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Beware of Social Media: NSA is tracking you on Facebook and Twitter

The policy was intended to help the agency “discover and track” connections between intelligence targets overseas and people in the United States, according to an NSA memorandum from January 2011.

The agency was authorized to conduct “large-scale graph analysis on very large sets of communications metadata without having to check foreignness of every email address, phone number or other identifier, the document said. Because of concerns about infringing on the privacy of US citizens, the computer analysis of such data had previously been permitted only for foreigners.

The agency can augment the communications data with material from public, commercial and other sources, including bank codes, insurance information, Facebook profiles, passenger manifests, voter registration rolls and GPS location information, as well as property records and unspecified tax data, according to the documents.

They do not indicate any restrictions on the use of such “enrichment” data, and several former senior Obama administration officials said the agency drew on it for both Americans and foreigners.

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