Social Media Report: Edelman and Twitter part ways The two started working together in September. Shortly thereafter the partnership started to sour, according to Advertising Age. By Michael SebastianDec. 22, 2011 SHARE Ragan Insider Premium Content Read the full story at Advertising Age. 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.