Chinese authorities have tightened already rigorous Internet controls by cracking down on online pornography and what state media called “rumormongers” and “slanderous content.” […] Xinhua said the government would also increase punishments for spreading rumors online, although it didn’t specify how it would do that. Already, Chinese courts can sentence people for up to three years in prison for writing online comments deemed defamatory. As part of the new campaign, the government has shut down websites and punished nearly 40 people it called rumormongers. …