China has tightened its rules on internet usage to enforce a previous requirement that users fully identify themselves to service providers.
The move is part of a package of measures which state-run Xinhua news agency said would protect personal information.
But critics believe the government is trying to limit freedom of speech.
The announcement will be seen as evidence China's new leadership views the internet as a threat.
The Chinese authorities closely monitor internet content that crosses its borders and regularly block sensitive stories through use of what is known as the Great Firewall of China.
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