Yesterday, the Guardian published details of a top secret National Security Agency program that allows analysts to search through vast databases containing emails, online chats and the browsing histories of millions of individuals virtually anywhere in the world. 

The program, called XKeyscore, confirms Edward Snowden's famous claim that from his workstation at Booz Allen he could "wiretap anyone, from you or your accountant, to a federal judge or even the President, if I had a personal e-mail."
Indeed, XKeyscore is terribly impressive by just how easily the massive data set can be searched.

Read though the training materials on XKeyscore here.

Fittingly, the ACLU testified yesterday before the Senate Judiciary Committee on the need to strengthen privacy rights.  You can read Jameel Jaffer and Laura Murphy's testimony here.