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 New to Retargeting, Twitter Abstains From Ad Industry's Privacy Program Has a Do-Not-Track Account Setting but Isn't Using 'AdChoices' Icon By Cotton Delo, Published on August 02, 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.