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 to Know Before Adding a Facebook 'Like' Button Social Plug-ins Are Great for News Sites, but They Can Make a Brand Site Less Social By Kevin Barenblat, Published on October 12, 2010 4 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.