Revelations Give Look at Spy Agency’s Wider Reach - NYTimes.com

Very big data and digital dilemmas

"Because of smartphones, tablets, social media sites, e-mail and other forms of digital communications, the world creates 2.5 quintillion bytes of new data daily, according to I.B.M.
The company estimates that 90 percent of the data that now exists in the world has been created in just the last two years. From now until 2020, the digital universe is expected to double every two years, according to a study by the International Data Corporation.
Accompanying that explosive growth has been rapid progress in the ability to sift through the information."

Revelations Give Look at Spy Agency’s Wider Reach - NYTimes.com