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 Marketing Community Reacts to Boston Marathon Bombing Hill Holliday, Mullen, Digitas, Confirm Staffers Unharmed; Brands Go Dark for Several Hours on Social Media By Michael McCarthy and Rupal Parekh, Published on April 15, 2013 1 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. Become a Member Already a member? Log in.