Edward Snowden is in exile in Moscow. He's still hard at work. Whatever he's working on, the former NSA contractor who exposed controversial US surveillance practices, says it's much tougher than his last gig. The fact is I was getting paid an extraordinary amount of money for very little work with very little in the way of qualifications. That's changed significantly," Snowden said in an event at Stanford University on Friday, via teleconference from Moscow. Last week, a federal appeals court ruled that the NSA's massive collection of Americans' phone records is illegal - a victory for Snowden, who revealed the existence of the surveillance program in the documents he leaked to the press. Snowden said in the teleconference that he worked with reporters so that there could be a system of checks and balances, and noted that he did not publish a single document himself. Still, he couldn't leak his secrets anonymously to the reporters because his colleagues' livelihoods would have been at risk as well if the NSA conducted a witch-hunt, Snowden said. "Whistleblowers are elected by circumstance. Nobody self nominates to be a whistleblower because it's so painful," Snowden said, [and] emphasized that he doesn't see himself as a hero or a traitor, but he had just reached the tipping point where he needed to do something.