Similar to traditional Web services, the Web 2.0 makes data and functionality accessible. Users can access Web 2.0 services by browsing the Web sites but also through APIs. Typically, APIs allow to add, change, and retrieve data. Content is disseminated by RSS/Atom feeds that allows users to pull the data without ever visiting the site itself. Most content created in the Web 2.0 is micro-content: small, self-contained units, such as blog entries, images and other multimedia content well suited for remixing [18]. This micro-content can be combined with other data and services, e.g., tags of Flickr photos can be used to show the location in Google Maps. In difference to traditional Web-services, the Web 2.0 approach is characterized by pragmatic solutions and lightweight formats.