The document discusses the three components of digital health: applications, devices, and infrastructure. It describes how digital health has the potential to improve clinical care, patient safety, information dissemination, and chronic condition management. The document then focuses on physician use of social media communities and mobile applications. It provides examples of popular physician social networks and describes how physicians use smartphones and apps to access medical references, education, and patient information at the point of care. The document also discusses emerging trends in online care delivery through digital diagnosis and communication with patients.