CANTON, Mass., Aug. 31, 2011—Dunkin’ Donuts, America’s all-day, everyday stop for coffee and baked goods, today announced its location-based promotion through Foursquare and Facebook ®, “Be The President Of Dunkin’ Nation.” The promotion, set to run for five weeks, allows guests who check in at Dunkin’ Donuts restaurants nationwide between August 22 and September 23 the chance to be named the “President of Dunkin’ Nation” and win a “Presidential Prize Package....