Social Media Twitter, Foursquare fuel customer loyalty program at Tasti D-Lite The frozen-treat chain linked its customer rewards program to popular social media channels with sweet results. By Matt WilsonNov. 9, 2010 SHARE 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.