The document provides an overview of Web 2.0 and Health 2.0. It defines Web 2.0 as the transition from static web pages to a more dynamic and user-generated web where users can interact and collaborate. Examples of Web 2.0 applications include blogs, wikis, social networks, and user reviews. Health 2.0 applies similar principles of user participation and collaboration to the healthcare field by enabling patients to access and share health information online. The document discusses how platforms like PatientsLikeMe allow patients to connect with others and participate more actively in their own healthcare.