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.
Source: The Guardian. Read full article. (link)