With Glenn Greenwald and Laura Poitras triumphantly returning to the US to accept the Polk Award with Barton Gellman and Ewan MacAskill yesterday, maybe it's time we revisit one of their first and most important stories: how much are internet companies like Facebook and Google helping the National Security Agency, and why aren't they doing more to stop it?

The CEOs of the major tech companies came out of the gate swinging 10 months ago, complaining loudly about how NSA surveillance has been destroying privacy and ruining their business. They still are. Facebook founder Mark Zuckerberg recently called the US a "threat" to the Internet, and Eric Schmidt, chairman of Google, called some of the NSA tactics "outrageous" and potentially "illegal". They and their fellow Silicon Valley powerhouses – from Yahoo to Dropbox and Microsoft to Apple and more – formed a coalition calling for surveillance reform and had conversations with the White House.