You’ve read all of your free items this month. To register, get added benefits and unlimited access to articles, Become a Member. Already a Member? Sign in. Advertising Age Article Abstract McCann Staffer Behind Million-Hoodie March to Protest Trayvon Martin Slaying Daniel Maree Kick-Started New York March With Social Media By Rupal Parekh, Published on March 23, 2012 13 Want more Access, Content & Connections? Upgrade to Membership. We are glad you are enjoying Advertising Age. To get uninterrupted access and additional benefits, become a member today. Register Now Already a member? Log in.