Social Media The 5 most popular stories on PR Daily this week Coca-Cola and Pepsi are used to being marketing rivals in the beverage aisle, but this week, each brand suffered a respective marketing misstep that rivaled for our readers’ attention. That, and more. By PR Daily StaffSept. 30, 2013 SHARE Ragan Insider Premium Content To read the full story, log in. Become a Ragan Insider member to read this article and all other archived content. Sign up today Already a member? Log in here. Learn more about Ragan Insider.