There was a clumsy early attempt to gag the sites when a senior minister pulled them up for hosting "objectionable content".

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Chinese authorities, it says, rely on service providers to filter searches, block critical Web sites, delete objectionable content and monitor e-mail traffic.

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One tool Magid advises parents to use with caution, however, is Web filtering software like Net Nanny or Cybersitter, which block objectionable content online.

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Locally-operated websites like the Chinese microblogging services, search engines, online video websites and blog hosts, are required by the government to remove any objectionable content.

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Advertising agencies that purchase media space through intermediary online networks require, in their contracts, specific warranties and obligations that the company's advertisements will not be associated with any objectionable content.

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White didn't think that checking songs for possibly objectionable political content -- a definite issue for the Chinese authorities -- would be a problem for his company's technology.

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And, I think that going along with that too, that playing these video games with the kids will also open up avenues for a conversation about some of the content that may be objectionable.

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Microblogging services were also ordered to monitor content more closely and remove objectionable posts more quickly.

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