Black Friday shoppers spent an average of 4.9 hours out at brick-and-mortar shops, according to data from Foursquare. Long lines meant that each shopper only visited 2.8 stores. The location-tracking service it was also able to determine that Best Buy JCPenney, and Macy’s saw the biggest increase in foot traffic on the big day. Dick’s Sporting Goods and Sports Authority rounded out… Read More...