Social Media Study: 93 percent of B-to-B marketers use social media The most popular site is LinkedIn, the study found. By Kevin Allen@kevin_j_allenApril 6, 2011 SHARE Respondents said the most important sites for social media marketing are: 1. LinkedIn (26 percent) 2. Facebook (20 percent) 3. Blogging (19 percent) 4. Customer communities (14 percent) 5. YouTube (7 percent). 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.