NSA Chief General Keith Alexander Speaks About PRISM at Black Hat - The CIO Report - WSJ

PRISM PR; also see A 30 Year-Old Hacker Just Cursed At The Most Powerful Man In Global Surveillance (Business Insider)

"“Industry doesn’t dump stuff to us and say, ‘here are interesting facts,’” he said, adding, “They are compelled by court order to comply.”
Information collected under the PRISM program, along with another program that collects phone data from millions of Americans, has been crucial to thwarting 54 terrorist plots, 13 of which were in the United States, said Gen. Alexander. For example, an intercepted email from a terrorist in Pakistan led to the interruption of the New York subway bombing plot in 2009, he said."

NSA Chief General Keith Alexander Speaks About PRISM at Black Hat - The CIO Report - WSJ