Foursquare has announced a partnership with American Express that will see cardholders receive discounts when they check in at retail locations in the U.S. That could help Foursquare establish its ability to deliver return on investment in social promotions, and might help the service fend off challenges from the likes of Facebook and Groupon, experts say. "[W]hile the AmEx deal gives Foursquare a foothold, the company needs many more national deals to prove that it's a platform of choice for mobile commerce," Tim Beyers writes.

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