Yes, but to be Orwellian the self-censorship must be borne out of government intimidation. In this case the government hasn't intimidated anyone, we were just leaked information.
Unless you want to argue that Snowden intentionally leaked the PRISM slides so that society would be intimidated by the governments reach, thus giving way to society censoring itself without them having to publicly punish people that were guilty of thought crimes. But that's getting into Alex Jones territory.
Unless you want to argue that Snowden intentionally leaked the PRISM slides so that society would be intimidated by the governments reach, thus giving way to society censoring itself without them having to publicly punish people that were guilty of thought crimes. But that's getting into Alex Jones territory.