Web 2.0 has emerged as the adopted suite of technologies by developers, users and business.  The new web 2.0 paradigm provides the technology that enables government, businesses and users to interact and integrate services and data and benefit The Wisdom of the Crowds.  Because of strong collaborative nature of Web 2.0 applications, mechanisms for trust management are crucial for its healthy development.  This workshop aims to identify, discuss and analyze the trust related challenges in the Web 2.0 arena, and the potential consequences in terms of privacy breaches and security vulnerabilities in such platforms.