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 Twitter: A Vampire That Can Legally Suck the Life Out of You The Latest Changes to Its Terms of Service Make Clear the True Price of Using the Microblogging Platform By Simon Dumenco, Published on September 21, 2009 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. Become a Member Already a member? Log in.