The Medical Web and Its Authors -- Applications of Social Media in Healthcare -- Objectives and Structure of the Book -- Types of Medical Social Media -- Excursus: Content and Language in Clinical Narratives -- Content and Language in Medical Social Media -- Text analytic-Enabled Healthcare Applications: Requirements and Architecture -- Information Extraction from Medical Social Media -- Relation Extraction -- Sentiment Analysis from Medical Texts -- Social Media for Health Monitoring -- Diversity-aware Search -- Implementation obstacles -- Ethics in Health Web Science -- Integrating Clinical and Social Media Data -- Concluding Remarks -- Glossary.