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Social reviews site Yelp isn't nearly as popular in New York as it is in San Francisco and management has been planning to do something about it. "They're gonna pump up efforts to conquer NYC, renting an office in Gramercy area and assign [an] East Coast community leader," a source with new details tells us. Yelp already has an ad sales office in New York's West Village, but our source says those people will move to the larger office further uptown by September as well. Yelp is a cousin to widgetmaker Slide, with Slide founder Max Levchin on Yelp's board. With Slide's own upcoming move to New York and Yelp's city expansion, we'd expect to see a lot more Levchin around the Alley, except, well, we hear he never leaves the office. (And if he did, we'd prefer he say hello to his bride to be first.)