"Thus far, it seems, Foursquare is holding its ground," writes NYT. Indeed, earlier this week it, announced registering over 10 million users, though, as the newspaper noted: "It would not say how many of those are active." Per the AmEx deal, "Foursquare users are accustomed to receiving awards in the form of coupons and digital merit badges.
"But more substantial deals like those being offered to American Express cardholders may bring Foursquare and other location-based services further into the mainstream." Initial business partners include Sports Authority and H&M, along with a few restaurants in New York, including Union Square Cafe and Blue Smoke.