London Guardian 
September 30, 2013
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.
Metadata provides a record of almost anything a user does online, from browsing history – such as map searches and websites visited – to account details, email activity, and even some account passwords. This can be used to build a detailed picture of an individual’s life.
The Obama administration has repeatedly stated that the NSA keeps only the content of messages and communications of people it is intentionally targeting – but internal documents reveal the agency retains vast amounts of metadata.
An introductory guide to digital network intelligence for NSA field agents, included in documents disclosed by former contractor Edward Snowden, describes the agency’s metadata repository, codenamed Marina. Any computer metadata picked up by NSA collection systems is routed to the Marina database, the guide explains. Phone metadata is sent to a separate system.
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