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A&W

THE popularity of the A&W Restaurants chain in the United States peaked in the 1960s and 1970s, when the number of locations — many with carhop service — swelled to 2,400, so it is no wonder that the brand stirs nostalgia in the baby boomer generation. But now A&W, which has about 700 restaurants, wants to make an impression on those boomers’ children, and the brand is increasingly turning to social media to do so.