Head over to the Coke page and Tweet @Sharehappiness as well as a friend (including their handle) with the hashtag #Happyplace to get a Buy One, Get One Free Coke 20 oz bottle coupon redeemable at Target! Click the “Tweet” button and all you should have to do is add your friend’s handle to the tweet they’ve already provided. You can redeem one coupon per mobile number per week, while supplies last.