Revealed: NSA Program Collects 'Nearly Everything a User Does on the Internet' 

XKeyscore gives 'widest-reaching' collection of online data; NSA analysts require no prior authorization for searches; Sweeps up emails, social media activity and browsing history

by Glenn Greenwald

A top secret National Security Agency program allows analysts to search with no prior authorization through vast databases containing emails, online chats and the browsing histories of millions of individuals, according to documents provided by whistleblower Edward Snowden.

The NSA boasts in training materials that the program, called XKeyscore, is its "widest-reaching" system for developing intelligence from the internet.