Coca-Cola just announced a new program aimed at social media users. Tweet-A-Coke gives Twitter users the opportunity to purchase and send Coke as a gift to their friends directly on the social media platform. Twitter was involved in a similar program last year with Starbucks. But it’s far from the only platform taking part in the new trend of social media commerce. So how many are interested in social media commerce? And how many have used it already?