American Express (or Amex as it likes to be called) has launched a purchase-by-tweet service.

Currently for US-based customers, credit-card holders will pay by posting a specific hashtag on Twitter to trigger a payment from their account.

Products from Amazon, Sony and Microsoft are being offered at a discount to entice customers to use the new service, which has been described as a gimmick unlikely to catch on by industry analysts.

Would you be comfortable paying by a Tweet? Is your account safe paying via Twitter? Post your views to our Twitter (@puddledigital) or Facebook page.

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