At the Charlie Brown Cafe in Singapore, on Orchard Road, customers that pay with a credit card from a local bank (UOB) get one free main dish for two purchased. But fans get one free dish for one purchased. Couples are fine! No need to be a threesome, unless you want to of course. Soon, the fan benefits sign will be sponsored by a financial institution, showing the full value of linking social media to payments.
Why do fans get bigger discounts? Because merchants get word of mouth advertising on Facebook.