The former Chinese official in charge of internet censorship, who hobnobbed with top executives from Facebook, Apple and Amazon and flatly denied that his government engaged in censorship, has been put under investigation by the Communist Party’s anti-corruption agency, state media reported on Tuesday. The downfall of the censorship official, Lu Wei, was a long time coming. He once held a cluster of titles that gave him formidable influence over internet policy. But he was removed from many posts last year, suggesting that his career was under a cloud.