Asking a U.S. company to filter access to a site based on a Web surfer's nationality is "very naive, " Yang said in the interview.

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Ministers instead called on internet service providers to encourage parents to switch on a filter to stop access to adult content.

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In addition, sites like Facebook have some obligation to filter out spammers, scammers, phishers and other slimey people who would use their access to the rest of us for abusive purposes.

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