Trying to avoid hipsters? Or looking for a bar that caters to the Mad Men crowd? Hoppit, a Manhattan-based startup that searches restaurants and bars based on ambiance (choices at left), has launched in 25 cities. Its founders describe Hoppit as a cross between Yelp and Pandora, which allows you to filter locations as they would appeal to, for example, a two-year-old, your great aunt Norma, or business colleagues. Or maybe all three; you be the judge.