Cancel your Yahoo email account or end up in a Chinese prison

While that's unlikely to happen to readers in the US or other Western countries, it has happened to Chinese journalist Shi Tao, thanks in part to information provided by Yahoo to Chinese authorities.

From the CS Monitor piece:

Shi was arrested in November, and convicted in April of "providing state secrets abroad." He had e-mailed personal notes from a staff meeting about overseas Chinese returning for the 15th anniversary of the Tiananmen massacre.

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"We think Yahoo's role is very sad in this case, and we hope Yahoo reexamines its policies," says Abi Wright of the Committee to Protect Journalists, which has been following Shi's case for months. "But frankly, it isn't Yahoo but the Chinese authorities who are jailing this man, and we feel the focus of attention needs to remain on the authorities."