The document discusses the new frontend architecture of Tuenti, the largest social network in Spain. Some key points: - It addresses concerns around flexibility, costs, schedule, integration, and organizational performance. - Responsibilities of the frontend include UI interactions, templating, client-server communication, interacting with backend/APIs, and controlling logic and data output. - The principle is a highly decoupled system with natural separation of concerns between structure, style, behavior, and data. - On the server-side, controllers interact freely to provide requested data, following a "Printer-Controller-Abstraction" model inspired by PAC architecture. - On the client-side, everything starts with a