Amnesty spokesman Neil Durkin said the partnership with SilverSurfers was part of a drive to tap into new demographic groups and boost supporter numbers.
It comes under the charity's 'Protect the Human' campaign, launched in October, which aims to raise the number of supporters in the UK from 250,000 to one million, Durkin added.
The appeal uses the SilverSurfer website to draw attention to Toan's case.
A link on the website sends an email to the Vietnamese authorities.
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