Zagat launched “The Twelve Days of Foodie Cheer” – an all-new photo contest available through Zagat’s contest page and Google+. Through the 12-day contest, Google+ users can enter original photos that best display holiday food — everything from gingerbread cookies and roasted chestnuts to holiday hams and other gourmet delights — for a chance to win a daily prize of a $500 gift certificate to a Zagat-rated restaurant of your…