New Delhi, Dec 20 : A new set of documents show how Chinese officials tap private businesses to generate content on demand, draw followers, track critics.That operation increasingly plays out on international platforms like Twitter and Facebook which the Chinese government blocks at home, New York Times reported.The documents which were part of a request for bids from contractors offer a rare glimpse into how Chinas vast bureaucracy works to spread propaganda and sculpt opinion on global social media, the report said.In May, Shanghai police posted a notice online seeking bids from private contractors for what is known among Chinese...