"The Intercept is publishing 48 top-secret and other classified documents about XKEYSCORE dated up to 2013, which shed new light on the breadth, depth and functionality of this critical spy system — one of the
“The Intercept is publishing 48 top-secret and other classified documents about XKEYSCORE dated up to 2013, which shed new light on the breadth, depth and functionality of this critical spy system — one of the largest releases yet of documents provided by NSA whistleblower Edward Snowden.”
See the article: NSA’s Google for the World’s Private Communications (The Intercept, link)