Last year American Express trialled a Twitter-based social commerce service, enabling Amex cardholders to get discounts on purchases made with their card (synced to their Twitter account) if they tweeted about[...]

Earlier this week we wrote about American Express and its campaign that allows cardholders to “sync” their AMEX cards to Twitter in order to take advantage discounts being offered by[...]

So here it is – the social commerce acid test.  Are people willing to share their social graph data with big brands in order to get personalized offers tailored to[...]