Also, this is very interesting from a NYTimes article on the matter: "But instead of adding a back door to their servers, the companies were essentially asked to erect a locked mailbox and give the government the key, people briefed on the negotiations said. Facebook, for instance, built such a system for requesting and sharing the information, they said."

They didn't give the NSA "direct access" to their system but created a front end for them instead... LOL.