American Express Co.'s cardholders will be able to sign up for merchant deals through Twitter, in the lender's latest move to tap social media to spur spending.
The New York-based company said Tuesday that the program will allow cardholders to sync their American Express business and consumer cards to their Twitter accounts. When they tweet using special offer "hashtags," or codes used to categorize Twitter messages, merchant coupons are loaded directly to their card accounts.
