Once-iconic American retailer Gap is in trouble. The brand was once so cool that Sharon Stone wore one of its turtlenecks to the Oscars. Today, the company is closing a quarter of its stores amid declining sales. Sales at the brand that once dominated mall retail have declined for 13 straight months, according to Hiroko Tabuchi and Hilary Stout at The New York Times. Instagram and other social media outlets play a big part in its demise, The New York Times reports.