The book "Advances in Collective Intelligence 2011" offers a comprehensive analysis of developments in the field of collective intelligence and its relevance to information and communication technologies. It highlights the motivation of users to participate in the value creation process and the necessity to develop innovative algorithms to manage the growing amount of shared data. The contributions come from international experts and cover a wide range of topics that are significant for the creation of knowledge, creativity, and innovation processes in emerging communities of practitioners. The quality of the submitted papers was ensured through a rigorous double-blind review process that focused on originality, quality, and relevance. This book is a valuable resource for researchers and practitioners addressing the challenges and opportunities of collective intelligence.