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POPSUS rebukes Yahoo over China case Shi Tao - who was jailed for 10 years - but it has since emerged that other Yahoo employees had a document stating it was to do with the "suspected illegal provision of state secrets". He also questioned how Mr Callahan could not have known of the document referring to "state secrets" - a charge commonly used to prosecute dissidents and pro-democracy activists. Yahoo's Michael Callahan wrote a letter to "beg the forgiveness" of Shi Tao's mother. Shi Tao was jailed for sending on to foreign websites an e-mail from the ruling Communist Party warning journalists not to cover the 15th anniversary of the Tiananmen Square massacre in 2004.