CISNA
Social network analysis laboratory
Computational & Interdisciplinar Social Network Analysis
We analyse social networks from an interdisciplinary perspective, using computational, mathematical and sociological techniques
Products
(opens in a new tab)CISNA-Nets
A platform for analysing online conversations as social and socio-semantic networks.
nets.cisna.cl
(opens in a new tab)CISNA-News
A laboratory tool for analysing news.
Open
(opens in a new tab)Vigilia
A tool for characterising disinformation in Spanish.
vigilia.uv.cl
Code
Research software and code published by the laboratory.
Pending
Current project
Polarisation
Fondecyt Regular 1250207, ANID, Chile
2025-2028
Modeling, analysis and conflict resolution in polarized social networks: A computational approach
Objective
To model and analyse the dynamics of polarised social networks using social network analysis, computational game theory and artificial intelligence techniques, in order to propose alternative ways of resolving structural conflicts.
Team
- Principal Investigator
- Fabián Riquelme
- Co-investigators
- Diego Rivera, Rodrigo Olivares
- Technical Staff
- Diego Monsalves, Carlos Escobedo, Anaís Berríos, David Alonso Díaz
- Thesis Students
- Francisco Muñoz
Institutions
- Host Institution
- Universidad de Valparaíso, Chile
- Associated Institution
- Universidad de las Américas, Chile
Results
2027
- Muñoz, F., Riquelme, F. (2027). Structural drivers of chordless cycle enumeration complexity in synthetic networks. Proceedings of 15th International Conference on Complex Networks and their Applications, Studies in Computational Intelligence Series, Springer-Verlag. (Accepted)
2025
- Riquelme, F., Monsalves, D., Olivares, P., & Vivar, M. A. (2025). Automatic Generation of Signed Networks from Argumentative Text-Based Discussions. In 2025 IEEE CHILEAN Conference on Electrical, Electronics Engineering, Information and Communication Technologies (CHILECON) (pp. 1–7).doi.org/10.1109/chilecon66915.2025.11475967 (opens in a new tab)
- Muñoz, F., Riquelme, F. Structural drivers of chordless cycle enumeration complexity in synthetic networks. 15th International Conference on Complex Networks and their Applications, December 2-4, 2026, Granada, Spain.
- Riquelme, F. Polarización en redes signadas como juegos de disrupción social. III Jornada de Redes, February 11-12, Santiago, Chile.
- Riquelme, F., Monsalves, D., Olivares, P., & Vivar, M. A. Automatic Generation of Signed Networks from Argumentative Text-Based Discussions. 2025 IEEE CHILEAN Conference on Electrical, Electronics Engineering, Information and Communication Technologies (CHILECON), October 28-30, Valparaíso, Chile.
Development
- CISNA-NetsCISNA-Nets (opens in a new tab)
- CISNA-NewsCISNA-News (opens in a new tab)
Past projects
Funding
XV Concurso Fondo de Estudios sobre el Pluralismo en el Sistema Informativo Nacional, ANID, Chile
Caracterización automática de desinformación y noticias falsas en español: un enfoque interdisciplinario desde la inteligencia artificial, el análisis lingüístico y del discurso
Objective
To understand how disinformation and fake news are produced in the Chilean context, in terms of both their content and the way that content takes hold.
Team
- Principal Investigator
- Fabián Riquelme
- Researchers
- Eduardo Puraivan, Diego Rivera, Magaly Varas, René Venegas
- Collaborating Researcher
- Claudia Mellado
- Lead Developer
- Nicolás Riquelme
- Developers
- Ángel Inostroza
- Research Assistants
- Anaís Berríos, Kristel Hidalgo, Jean Carlos Órdenes
Institutions
- Host Institution
- Universidad de Valparaíso, Chile
- Associated Institutions
- Pontificia Universidad Católica de Chile, Pontificia Universidad Católica de Valparaíso, Universidad de Viña del Mar
- Collaborating Institutions
- Centro de Estudios Interdisciplinarios en Teoría Social y Subjetividad (CEI-TESyS)
Results8
Articles
2025
- Puraivan, E., Riquelme, F., & Venegas, R. (2025). A Linguistic Features-Based Approach for the Functional Analysis of Disinformation in Spanish. IEEE Access, 13, 140205–140222.doi.org/10.1109/access.2025.3595750 (opens in a new tab)
- Riquelme, F., Puraivan, E., Rivera, D., Varas, M., Venegas, R., Mellado, C., … Riquelme, N. (2025). Muertes de celebridades: Sobre la clasificación automática de noticias falsas no intencionadas. Ingeniare. Revista Chilena De Ingeniería, 32.doi.org/10.4067/s0718-33052024000100238 (opens in a new tab)
- Calderón, J. C., Puraivan, E., Riquelme, F., & Venegas, R. (2025). Analysis of Verbs as Linguistic Markers in Political Disinformation. In Lecture Notes in Networks and Systems (pp. 517–526). Springer Nature Singapore.doi.org/10.1007/978-981-96-6441-2_43 (opens in a new tab)
- Calderón, J. C., Puraivan, E., Venegas, R., & Riquelme, F. (2025). Classification of Political Disinformation Texts in Spanish: A Multiclass Approach Based on Machine Learning and Linguistic Features. In Lecture Notes in Networks and Systems (pp. 445–455). Springer Nature Singapore.doi.org/10.1007/978-981-96-6441-2_37 (opens in a new tab)
2024
- Rivera López, D., Riquelme Csori, F., Vernier, M., Balboa, A., Berríos, A., Rivera, V. V., Núñez, A., & Vivar, M. A. (2024). Funcionamiento discursivo de la extrema derecha chilena en prensa y TikTok. Revisionismo histórico a 50 años del Golpe de Estado. Letras (Lima), 95(141), 304–324.doi.org/10.30920/letras.95.141.18 (opens in a new tab)
Conferences
- F. Riquelme , E. Puraivan, D. Rivera, M. Varas, R. Venegas, C. Mellado, A. Berríos, K. Hidalgo, Á. Inostroza, J.-C. Órdenes, N. Riquelme. Muertes de celebridades: Sobre la clasificación automática de noticias falsas no intencionadas. II Congreso Internacional de Investigación Interdisciplinaria, Ingeniería y Empleabilidad (CINVIE 2024), October 28-30, Valparaíso, Chile.
Development
- VigiliaVigilia (opens in a new tab)
Datasets
- F. Riquelme et al., "FalleciDades_ES: Dataset de noticias en español reales y falsas sobre fallecimientos de celebridades." Zenodo, Jul. 28, 2024. doi: 10.5281/ZENODO.13117808doi.org/10.5281/ZENODO.13117808 (opens in a new tab)
Final report
Press coverage
- Dr. Fabián Riquelme sobre las fake news (opens in a new tab)Radio Valentín Letelier, “Revolución Digital”, con Marco Aravena, 21 August 2024
- Entrevista a Fabián Riquelme (opens in a new tab)Radio Valentín Letelier, “Sin Filtro UV”, con Lorena Ruiz, 6 August 2024
- Investigador en medios: “las fake news tienen rasgos lingüísticos que dan una falsa impresión de profundidad (opens in a new tab)Diario Usach, 5 July 2024
- Las fake news tienen rasgos lingüísticos que dan una falsa impresión de profundidad (opens in a new tab)Radio Usach, “Sin Pretexto”, con Mirna Schindler, 2 July 2024
- Algunos creadores de fake news buscan un efecto similar al de un pirómano (opens in a new tab)Las Últimas Noticias, 29 June 2024
- Investigadores analizan fenómeno de rumores falsos sobre muertes de celebridades (opens in a new tab)G5 Noticias, 28 June 2024
- Investigadores analizan fenómeno de rumores falsos sobre muertes de celebridades (opens in a new tab)UV.cl, 28 June 2024
Funding
Fondecyt de Iniciación, ANID, Chile
The role of individual and group centrality in the influence spread process within social networks
Objective
To analyse, measure and visualise how groups of individuals with high centrality affect influence spread dynamics within a social network.
Team
- Principal Investigator
- Fabián Riquelme
- Technical Staff
- Francisco Muñoz
- Thesis Students
- José Antonio Vera, Eduardo Puraivan, Jean Billiard
Institutions
- Host Institution
- Universidad de Valparaíso, Chile
Results24
Articles
2023
- Riquelme, F., Muñoz, F., & Olivares, R. (2023). A depth-based heuristic to solve the multi-objective influence spread problem using particle swarm optimization. OPSEARCH, 60(3), 1267–1285.doi.org/10.1007/s12597-023-00662-z (opens in a new tab)
- Monsalves, D., Cornide-Reyes, H., & Riquelme, F. (2023). Relationships Between Social Interactions and Belbin Role Types in Collaborative Agile Teams. IEEE Access, 11, 17002–17020.doi.org/10.1109/access.2023.3245325 (opens in a new tab)
- Riquelme, F., Muñoz, R., Vivar, M. A., & Billiard, J. (2023). Studying Alumni’s Education and Work Experience Through Social Network Analysis: A LinkedIn Case Study. In 2023 XLIX Latin American Computer Conference (CLEI) (pp. 1–9). IEEE. 2023 XLIX Latin American Computer Conference (CLEI).doi.org/10.1109/clei60451.2023.10346169 (opens in a new tab)
- Puraivan, E., Venegas, R., & Riquelme, F. (2023). An empiric validation of linguistic features in machine learning models for fake news detection. Data & Knowledge Engineering, 147, 102207.doi.org/10.1016/j.datak.2023.102207 (opens in a new tab)
- Molinero, X., Riquelme, F., Roura, S., & Serna, M. (2023). Multidimension: a dimensionality extension of simple games. Computational and Applied Mathematics, 42(8).doi.org/10.1007/s40314-023-02471-y (opens in a new tab)
- Molinero, X., Riquelme, F., Roura, S., & Serna, M. (2023). On the generalized dimension and codimension of simple games. European Journal of Operational Research, 306(2), 927–940.doi.org/10.1016/j.ejor.2022.07.045 (opens in a new tab)
2022
- Riquelme, F., & Vera, J.-A. (2022). A parameterizable influence spread-based centrality measure for influential users detection in social networks. Knowledge-Based Systems, 257, 109922.doi.org/10.1016/j.knosys.2022.109922 (opens in a new tab)
- Olivares, R., Soto, R., Crawford, B., Riquelme, F., Munoz, R., Ríos, V., Cabrera, R., & Castro, C. (2022). Entropy–Based Diversification Approach for Bio–Computing Methods. Entropy, 24(9), 1293.doi.org/10.3390/e24091293 (opens in a new tab)
- Riquelme, F., Rivera, D., & Serrano, B. (2022). Analyzing the far-right political action on Twitter: the Chilean constituent process. Social Network Analysis and Mining, 12(1).doi.org/10.1007/s13278-022-00990-w (opens in a new tab)
- Providel, E., Toro, D., Riquelme, F., Mendoza, M., & Puraivan, E. (2022). CLNews: The First Dataset of the Chilean Social Outbreak for Disinformation Analysis. In Proceedings of the 31st ACM International Conference on Information & Knowledge Management (pp. 4394–4398). ACM. CIKM ’22: The 31st ACM International Conference on Information and Knowledge Management.doi.org/10.1145/3511808.3557560 (opens in a new tab)
- Riquelme, F., Olivares, R., Muñoz, F., Molinero, X., & Serna, M. (2022). Extremal Coalitions for Influence Games Through Swarm Intelligence-Based Methods. Computers, Materials & Continua, 70(3), 6305–6321.doi.org/10.32604/cmc.2022.021804 (opens in a new tab)
2021
- Molinero, X., & Riquelme, F. (2021). Influence decision models: From cooperative game theory to social network analysis. Computer Science Review, 39, 100343.doi.org/10.1016/j.cosrev.2020.100343 (opens in a new tab)
- Riquelme, F., Muñoz, F., & Olivares, R. (2021). Social influence under improved multi-objective metaheuristics. In Proceedings of the 2021 IEEE/ACM International Conference on Advances in Social Networks Analysis and Mining (pp. 479–486). ACM. ASONAM ’21: International Conference on Advances in Social Networks Analysis and Mining.doi.org/10.1145/3487351.3488558 (opens in a new tab)
- Olivares, R., Muñoz, F., & Riquelme, F. (2021). A multi-objective linear threshold influence spread model solved by swarm intelligence-based methods. Knowledge-Based Systems, 212, 106623.doi.org/10.1016/j.knosys.2020.106623 (opens in a new tab)
- Puraivan, E., Godoy, E., Riquelme, F., & Salas, R. (2021). Fake news detection on Twitter using a data mining framework based on explainable machine learning techniques. IET Conference Proceedings, 2021(1), 157–162.doi.org/10.1049/icp.2021.1450 (opens in a new tab)
- Riquelme, F., Aguilera, A., & Inostrosa-Psijas, A. (2021). Contagion Modeling and Simulation in Transport and Air Travel Networks During the COVID-19 Pandemic: A Survey. IEEE Access, 9, 149529–149541.doi.org/10.1109/access.2021.3123892 (opens in a new tab)
Conferences
- Riquelme, F.; Munoz, R.; Vivar, M.-A. Billiard, J. Studying alumni's education and work experience through social network analysis: A LinkedIn case study. XLIX Conferencia Latinoamericana de Informática (CLEI 2023). La Paz, Bolivia.
- Molinero, X.; Riquelme, F.; Serna, M. Power indices in cooperative games with supporters and enemies. 30th European Conference on Operational Research (EURO 2022). Espoo, Finland.
- Riquelme, F.; Muñoz, F. Olivares, R. Social influence under improved multi-objective metaheuristics. 2021 IEEE/ACM International Conference on Advances in Social Networks Analysis and Mining. The Hague, Netherlands.
- Olivares, R.; Muñoz, F.; Riquelme, F. A multi-objective linear threshold influence spread model solved by swarm intelligence-based methods. Lo Mejor de lo Nuestro (LMN 2021), from 40th International Conference of the Chilean Computer Science Society (SCCC 2021). La Serena, Chile
Development
- Muñoz, F., Riquelme, F., & Olivares, R. (2023). Swarm intelligence algorithms for multi-objective max-min-ISP [Computer software]. figshare.doi.org/10.6084/M9.FIGSHARE.21944771 (opens in a new tab)
- Muñoz, F., Olivares, R., & Riquelme, F. (2022). Swarm intelligence algorithms for multi-objective IMP: Step-by-step improvement [Computer software]. figshare.doi.org/10.6084/M9.FIGSHARE.19086698 (opens in a new tab)
- Muñoz, F., Riquelme, F., & Olivares, R. (2021). Swarm intelligence algorithms for width and length on influence games [Computer software]. figshare.doi.org/10.6084/M9.FIGSHARE.14933259 (opens in a new tab)
- Muñoz, F., Olivares, R., & Riquelme, F. (2020). Swarm intelligence algorithms for multi-objective IMP [Computer software]. figshare.doi.org/10.6084/M9.FIGSHARE.13046342 (opens in a new tab)
Final report
Theses
- 2025: Eduardo Puraivan. Detección automática de noticias falsas en español considerando clasificación multinivel y diversidad de contextos, Doctorado de Ingeniería Informática Aplicada, Universidad de Valparaíso, Chile. Prof. Guía: Fabián Riquelme. Prof. Coguía: René Venegas.
- 2024: Jean Billiard. Influencia de las redes de estudiantes universitarios en sus posteriores redes de contacto laborales, Magister en Informática Aplicada, Universidad de Valparaíso, Chile. Prof. Guía: Fabián Riquelme.
- 2022: José Antonio Vera. Centralidad de individuos en redes sociales basada en modelos de dispersión de influencia. Título de Ingeniero Civil Informático. Escuela de Ingeniería Informática, Universidad de Valparaíso, Chile. Prof. Guía: Fabián Riquelme.
Contact
For enquiries about the laboratory, its projects or its data, write to
fabian.riquelme@upc.edu