Thesetransactions publish research in computer-based methods of computationalcollective intelligence (CCI) and their applications in a wide range of fieldssuch as the semantic Web, social networks, and multi-agent systems. TCCIstrives to cover new methodological, theoretical and practical aspects of CCIunderstood as the form of intelligence that emerges from the collaboration and competitionof many individuals (artificial and/or natural). The application of multiplecomputational intelligence technologies, such as fuzzy systems, evolutionarycomputation, neural systems, consensus theory, etc., aims to support human andother collective intelligence and to create new forms of CCI in natural and/orartificial systems. This nineteenth issue contains 11 carefully selected andrevised contributions.