I just love what American Express is doing with their Foursquare deals. Very smart and innovative thinking. And this is another great example of how a credit card company can communicate very effectively by doing something that is actually relevant to so many people and businesses and increasing use of card in the process. And very cool that they actually provide small business the template to build websites, mobile platforms and promotional items. They got the right idea at Crispin Porter and AMEX. Again.