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 What the Tweetdeck Acquisition Means for Marketers Once Open, Twitter Is Now Becoming Part of the 'Splinternet' By Josh Bernoff, Published on May 26, 2011 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.