I. Different Theoretical Views on Mass Collaboration -- A History of Mass Collaboration.- Social and Systemic Epistemology -- Mass Collaboration as Co-Evolution between Cognitive and Social Systems -- Cultures of Participation -- From Distributed Cognition to Collective Intelligence -- II. Tools and Environments for Mass Collaboration -- Collective Knowledge in Tagging Environments -- Participatory Discovery Networks: The Future of Online Learning -- Collaboration and Cooperation -- Language Technology for Mass Collaboration in Education -- Mass Collaboration as a Basis of Procedures for E-Participation -- III. Wikipedia as a Tool to Analyze Mass Collaboration -- Individual vs. Collaborative Information Processing: The Case of Biases in Wikipedia -- A Tool for Analyzing Language Points of View in Wikipedia -- Understanding and Bridging the Points of View in the Wikipedia Language Gap -- SNA in Wikipedia.