Social Media Pinterest to drive 40 percent of all social media purchases The extent of the social pinboard’s increasing influence may surprise you. By Regina WoodJune 25, 2012 SHARE Facebook and Twitter, make room. Pinterest’s marketing power is growing. To read the full story, log in. Become a Ragan Insider member to read this article and all other archived content. Sign up today Already a member? Log in here. Learn more about Ragan Insider.