Social Media Infographic: How the FTSE 100 uses social media Today, 67 members of the index are actively engaged in social media. Find out which ones are embracing it, and how they’re using it. By Michael SebastianJune 3, 2011 SHARE The FTSE 100 is a share index of the 100 most highly capitalized U.K. companies listed on the London Stock Exchange. 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.