Edward Snowden, Glenn Greenwald and Laura Poitras, the whistleblower and journalists behind the NSA revelations, conducted a Reddit AMA on Monday to coincide with the release of HBO's Citizenfour, which won the Oscar for best documentary feature on Sunday night.

Edward SnowdenEdward Snowden's Citizenfour won the Oscar for best documentary

Things started with a bang when one user asked the whistleblower, "Don't you fear that at some point you will be used as leverage in a negotiation? eg; "if you drop the sanctions we give you Snowden."

"It is very realistic that in the realpolitik of great powers, this kind of thing could happen. I don't like to think that it would happen, but it certainly could," came the reply.

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When asked what Moscow was like, Snowden explained to one user, "Moscow is the biggest city in Europe. A lot of people forget that. Shy of Tokyo, it's the biggest city I've ever lived in. I'd rather be home, but it's a lot like any other major city."

On the revelation that shocked him most, Greenwald said: "For me personally, the most shocking revelation was the overall one that the explicit goal of the NSA and its allies is captured by the slogan "collect it all" - meaning they want to convert the internet into a place of limitless, mass surveillance, which is another way of saying they literally want to eliminate privacy in the digital age."

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Citizenfour is one of the best reviewed movies of the year.

"Vital, urgent, and breathtaking," said C.J Johnson of ABC Radio, "It is brilliant because it captures an intimate moment of history that will reverberate through the ages; a moment that would not have been captured had not a connection been made."