Weibo reports disciplinary action to halt the spread of rumors "causing social unrest" on the social media service.
This morning, Sina Weibo micro-bloggers received a message from a System Administrator, whose avatar is a giant eye wearing a police cap.
"Recently, some criminals have been using Sina Weibo to senselessly fabricate and spread vicious political rumors and cause social unrest," the message read, "Don't spread rumors, don't believe rumors, report rumors in a timely manner."
Three users' accounts were reportedly closed by administrators for spreading rumors.
The notification comes after the sacking of Chongqing Party Chief Bo Xilai resulted in rampant speculation on micro-blogging sites like Sina Weibo regarding Bo's alleged illegal activity and widespread chatter about a coup, which turned out to be false.
Today, searching Weibo for "Bo Xilai" -- the Chinese characters for his name as well as pinyin transliteration -- produces a message saying that because of recent legal action, information on the leader has been censored.