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 Stock Advice: Sell Facebook, Buy Amazon Social Groundswells Are Fine, But They Will Never Match Hard-Nosed Targeting of Purchase Behavior By Brian Sheehan, Published on October 09, 2012 5 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.