KCIJ(Korea Center for Investigative Journalism) exposed the National Intelligence Service(NIS), South Korea's spy agency illegally did political campaigning and manipulated public opinion during presidential election in 2012. KCIJ found out that the spy agency had formed secretive cyber psychological warfare unit, created at least 660 Twitter accounts. KCIJ identified those accounts posted or re-tweeted 280,000 tweets usually criticising the opposition candidates for helping the ruling party candidate.

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