More and more healthcare professionals continue to join Twitter to share knowledge and help improve public health. For those who are new to the platform, HealthJoy has released a list of the top 100 influencers in healthcare on Twitter. The list is based on social media presence and reach, using the number of shares of posts to determine popularity. Those on the list include Jonathan Bush, cofounder and CEO of Athenahealth, and Richard Duszak, M.D., chief medical officer of the Neiman Health Policy Institute. Announcement