Today's retailers and brands must be active on social media because that's where shoppers are spending significant amounts of time. But it's not enough to just have a Facebook page and a Twitter account, or even to simply monitor likes, shares and retweets. Increasingly, it takes interactive activities such as contests, quizzes and polls, gamification and user-generated content. Download this Retail TouchPoints special report to learn about four proactive social media strategies that boosted sales and raised brand profiles for companies as diverse as Starbucks, Casper, Frito-Lay and Forever 21.