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 The Year in Trending Topics: Top 10 Companies on Twitter in 2010 What the Trend's Year in Review, Day 1 of 3 By Simon Dumenco, Published on December 28, 2010 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. Register Now Already a member? Log in.