In 3 sentences or less: Bart Brandenburg is a Twitter doctor in the Netherlands who uses social media to provide medical advice, reassurance, and triage to patients. He has over 2400 followers and sends around 4500 tweets per year, providing a valuable service to 0.6% of active Dutch Twitter users. While social media use in healthcare is still in early stages, it shows promise for treating patients, teaching others, and allowing doctors to continuously learn.