NSA stores metadata of millions of web users for up to a year, secret files show
The National Security Agency is storing the online metadata of millions of Internet users for up to a year, regardless of whether or not they are persons of interest to the agency, top secret documents reveal.
The New York Times reported that the NSA was using its metadata troves to build profiles of US citizens' social connections, associations and in some cases location, augmenting the material the agency collects with additional information bought in from the commercial sector, which is not subject to the same legal restrictions as other data. The ability to look back on a full year's history for any individual whose data was collected -- either deliberately or incidentally -- offers the NSA the potential to find information on people who have later become targets. But it relies on storing the personal data of large numbers of Internet users who are not, and never will be, of interest to the US intelligence community. By confirming that all metadata "seen" by NSA collection systems is stored, the Marina document suggests such collections are not merely used to filter target information, but also to store data at scale.