New York City-based geolocation start up, foursquare, is so popular its staff can't field requests fast enough. That's the message in this report from ClickZ. However, some requests, especially those from big brands, are being met. The company has already developed integrations with a range of brand advertisers in various verticals, including Starbucks for retail, Bravo in entertainment, Pepsi in packaged goods, and …
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