Blogs are sometimes shut down altogether, temporarily or permanently. But the authorities do not yet seem to have an answer to the proliferation of public opinion in this form.

The new wave of blogging took off earlier this year. In the past, a few pioneers of the form stood out, but now huge communities of bloggers are springing up around the country, with many of them promoting one another's online offerings, books, music or, as in Mu Mu's case, a running, highly ironic commentary about sexuality, intellect and political identity.

"The new bloggers are talking back to authority, but in a humorous way," said Xiao Qiang, director of the China Internet Project at the University of California, Berkeley. "People have often said you can say anything you want in China around the dinner table, but not in public. Now the blogs have become the dinner table, and that is new.

"The content is often political, but not directly political, in the sense that you are not advocating anything, but at the same time you are undermining the ideological basis of power."

A fresh example was served up last week with the announcement by China of five cartoonlike mascot figures for the 2008 Olympics in Beijing. They were lavishly praised in the press -- and widely ridiculed in blogs that seemed to accurately express public sentiment toward them.

"It's not difficult to create a mascot that's silly and ugly," wrote one blogger. "The difficulty is in creating five mascots, each sillier and uglier than the one before it."

A leading practitioner of the sly, satirical style that is emerging here as an influential form of political and social commentary is a 38-year-old Beijing entertainment journalist named Wang Xiaofeng. Mr. Wang, who runs a site called Massage Milk, is better known to bloggers by his nickname, Dai San Ge Biao, which means Wears Three Watches.