It shouldn't come as a surprise that Bussmann made this list. The former SAP exec has been crowned the "most social CIO" for his presence on Twitter and elsewhere. Cheri Mangum, head of marketing at Freeborders, explains why she follows Bussmann: "As Freeborders is a SAP Services partner, I started following Bussmann to get timely market insights when he was still with SAP," she says. "He gives valuable comments on trends like mobile and analytics and is not afraid to try new social media tools. As he is now Group CIO at UBS, I am looking forward to [getting] his view on the role of IT in preparing financial services for the future."