How American Express is becoming the 'social credit card'

It's hard to put a price on a Twitter hashtag, but American Express is coming closer than anyone else ever has. Starting in March, the credit card issuer encouraged customers to " tweet your way to savings " through a relatively simple process: Customers link their credit cards to their Twitter accounts, then start tweeting special hashtags to get discounts automatically applied to their cards. "We want to be everywhere our card members and merchants are—a read more...