In a recent survey of 1,400 chief financial officers by staffing service Robert Half Management Resources, social media came in second -- after connecting through professional groups -- as the best way to increase professional visibility. Publishing articles, speaking, and volunteering for charitable groups were tied for third. Participating in social media networks is a proactive way to become known. The most popular social media sites for executives, says Paul McDonald, executive director of Robert Half Management Resources, are LinkedIn, which is good for professional networking, and Twitter, which provides an easy way for executives to share links to articles and relevant blogs. Learning professionals can give guidance on what's appropriate and what's not appropriate by developing a social media policy, says McDonald. He also advises sharing information on how each of the major social media outlets works, as well as the policies and guidelines via email, intranets, and other avenues.