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 In Pursuit of Revenue, Social Networks Ramp Up Ad Targeting Facebook Goes the Route of Direct Marketing, While Twitter Plays It Safe With Focus on User Interests By Michael Learmonth, Published on September 10, 2012 0 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.