Marketers are rushing to tap into Foursquare's location tools, but the social network is struggling to keep up with demand. Several agencies say they've been frustrated by their efforts to work with the company, complaining about the service's "Wild West" attitude to marketers and limited resources. "They're not responsive and extremely hard to work with. It's hard to bring campaigns to life. ... It's black magic," complains one digital-advertising executive.
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