Starbucks: 12 Days of Sharing Promo (Starts 12/1)November 16, 2010 by Mitchell Wischmann This post may contain a link to an affiliate. See my disclosure policy for more information. Starbucks has an upcoming “12 Days of Sharing” promotion! Text 12DAYS to 29943 to sign up. You’ll receive one offer per day starting on December 1st.**Standard text messaging rates apply.