American Express has launched a new service that turns Twitter hashtags into purchases. American Express cardholders who sync their eligible cards and tweet special hashtags can buy American Express gift cards and products from Amazon, Sony, Urban Zen and Xbox 360. American Express' Card Sync technology powers the experience. Card Sync first launched on Twitter last March to deliver 'couponless savings' to cardholders who tweet special offer hashtags from merchants.

American Express cardholders can sync their eligible cards with Twitter to purchase products and access content.

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The new payment channels are appearing regularly. Ignore them at your peril or sign up with one of the multi-channel providers - either from a bank or a third party.