Activities

Tutorials at International conferences

User profiling with Graph Neural Networks

Explainable recommender systems

Algorithmic bias and fairness in recommender systems

Group recommendation

  • Challenges and Solutions in Group Recommender Systems, at the 17th IEEE International Conference on Data Mining (ICDM 2017), New Orleans (USA), November 18-21, 2017.
  • Group Recommender Systems, at the 10th ACM Conference on Recommender Systems (RecSys 2016), Boston (USA), September 19, 2016.
  • Group Recommendation: Theory, Algorithms, and Applications, at the 22nd European Conference on Artificial Intelligence (ECAI 2016), The Hague (Netherlands), August 29, 2016.
  • Group Recommender Systems: State of the Art, Emerging Aspects and Techniques, and Research Challenges, at the 38th European Conference on Information Retrieval (ECIR 2016), Padua (Italy), March 20, 2016.

User modeling and personalization for mobility

  • Data Sources and Techniques to Mine Human Mobility Patterns (with C. Herrero, A. Kaltenbrunner, M. Manca, G. Stilo), at the 5th IEEE International Conference on Data Science and Advanced Analytics (DSAA 2018), Turin (Italy), October 2, 2018.

Invited and keynote talks

  • Social Dynamics in Group Recommender Systems, at 4th Workshop on Group Modeling, Adaptation and Personalization (GMAP), June 19, 2025.
  • Artificial Intelligence for Personalization in Media: How Can Technological Advances Meet Regulations and Public Service Requirements?, Data Technology Seminar 2025, March 11, 2025.
  • Enhancing Explainable Personalization with Faithful Generative Models on Knowledge Graphs, Human-centered Artificial Intelligence (HCAI) group at the Linz Institute of Technology, January 30, 2025.
  • Counterfactual Graph Augmentation for Consumer Unfairness Mitigation in Recommender Systems, Universitat de Barcelona, 21/02/2024.
  • Recommender Systems Robustness: the Impact of Attacks on Accuracy and Beyond, at the Workshop on Design, Evaluation and Deployment of Robust Recommender Systems – RobustRecSys @ RecSys2024 (Bari, Italy), October 17, 2024.
  • Interplay between Upsampling and Regularization for Provider Fairness in Recommender Systems. Mila – Quebec Artificial Intelligence Institute, Online, December 1, 2022.
  • Interplay between Upsampling and Regularization for Provider Fairness in Recommender Systems. University of Glasgow, Online, November 28, 2022.
  • How do data imbalances impact on the recommendations we get? Possible consequences in terms of algorithmic bias and algorithmic fairness. BBC Data Dates, Online, September 28, 2022.
  • Generating Recommendations to Automatically-Detected Groups of Users. Sapienza University of Rome, Rome (Italy), November 4, 2015.
  • Group Recommendation with Automatic Detection of Groups. Yahoo! Research Barcelona Seminar, Barcelona (Spain), July 24, 2010.

University Service (University of Cagliari, Italy)

Degree programme service

  • Internationalization Committee — B.Sc. in Applied Computer Science and Data Analytics (Informatica Applicata e Data Analytics), Internationalization Delegate/Representative, 13 Oct 2022 – Present.
  • Degree Programme Tutor — B.Sc. in Applied Computer Science and Data Analytics (Informatica Applicata e Data Analytics), 13 Oct 2022 – Present.
  • Quality Assurance Representative (Referente per la Qualità) — B.Sc./M.Sc. in Computer Science (linked degree programmes), 03 Sep 2024 – Present.
  • Degree Programme Self-Evaluation Committee — B.Sc./M.Sc. in Computer Science (linked degree programmes), Member, 03 Sep 2024 – Present.

Department service

  • Timetabling and Classroom Allocation Committee — Department of Mathematics and Computer Science, Member, 18 Sep 2024 – Present.
  • Department Self-Evaluation Committee (CAV-Dip) — Department of Mathematics and Computer Science, Member, 18 Sep 2024 – Present.

Interdepartmental centre

  • Board of Directors — Cagliari Accessibility Lab (CAL), Interdepartmental Centre, Member, 03 Mar 2023 – Present.

Editorial Board

  • Knowledge and Information Systems (Springer). Associate Editor, 2024 – Present.
  • Journal of Intelligent Information Systems (Springer). Editorial Board member, 2021 – Present.
  • Information Processing & Management (Elsevier). Editorial Board member, 2019 – Present.

Guest Editorships

  • Information Systems Frontiers (Springer) – Special Issue: Behavioral-Data Mining in Information Systems and the Big Data Era.
  • Information Retrieval Journal (Springer) – Special Issue: Social Media for Personalization and Search.
  • International Journal of Human-Computer Studies (Elsevier) – Special Issue: Advances in Computer–Human Interaction for Recommender Systems (AdCHIReS).
  • Journal of Intelligent Information Systems (Springer) – Special Issue: Data-Driven User Behavioral Modeling: From Real-World Behavior to Knowledge, Algorithms, and Systems.
  • Information Processing & Management (Elsevier) – Special Issue: Algorithmic Bias and Fairness in Search and Recommendation.
  • International Journal of Human-Computer Studies (Elsevier) – Special Issue: User Perspectives in Human-Centered Artificial Intelligence.
  • Information Systems Frontiers (Springer) – Special Issue: Human-Centric and Generative AI for Information Access.

Conference chairing

  • The 17th ACM Conference on Recommender Systems (RecSys 2023), Workshop track, with Mi Zhang and Victor Sheng
  • The 31st ACM Conference on User Modeling, Adaptation and Personalization (UMAP 2023), Demo and Late Breaking Results track, with Alisa Rieger and Shaghayegh (Sherry) Sahebi
  • The 30th ACM Conference on User Modeling, Adaptation and Personalization (UMAP 2022), General chair, with Alejandro Bellogín and Olga C. Santos
  • The 33rd ACM Conference on Hypertext and Social Media (HT 2022), General chair, with Alejandro Bellogín
  • The 16th ACM Conference on Recommender Systems (RecSys 2022), “Demo and Late Breaking Results” track co-chair, with Pigi Kouki
  • The 15th ACM Conference on Recommender Systems (RecSys 2021), “Demo” track co-chair, with Pigi Kouki
  • The 29th Conference on User Modeling, Adaptation and Personalization, “Personalized Recommender Systems” track co-chair, with Alejandro Bellogin and Sole Pera
  • The 14th ACM Conference on Recommender Systems (RecSys 2020), “Demo and Late Breaking Results” track co-chair, with Denis Parra

Organization of scientific meetings

  • Second International Workshop on Recommender Systems for Sustainability and Social Good (RecSoGood 2025), at the 19th ACM Conference on Recommender Systems (RecSys 2025). Co-chair with Allegra De Filippo, Elisabeth Lex, Francesca Maridina Malloci, Noemi Mauro, Francesco Ricci.
  • Sixth International Workshop on Algorithmic Bias in Search and Recommendation (Bias 2025), at the 48th International ACM SIGIR Conference on Research and Development in Information Retrieval (SIGIR 2025). Co-chair with Alejandro Bellogin, Styliani Kleanthous, Elisabeth Lex, Francesca Maridina Malloci, Mirko Marras.
  • First International Workshop on Recommender Systems for Sustainability and Social Good (RecSoGood 2024), at the 18th ACM Conference on Recommender Systems (RecSys 2024). Co-chair with Allegra De Filippo, Elisabeth Lex, Francesco Ricci.
  • Fifth International Workshop on Algorithmic Bias in Search and Recommendation (Bias 2024), at the 47th International ACM SIGIR Conference on Research and Development in Information Retrieval (SIGIR 2024). Co-chair with Alejandro Bellogin, Styliani Kleanthous, Elisabeth Lex, Francesca Maridina Malloci, Mirko Marras.
  • First International Workshop on Graph-Based Approaches in Information Retrieval (IRonGraphs 2024), at the 46th European Conference on Information Retrieval (ECIR 2024). Co-chair with Daniele Malitesta, Mirko Marras, Giacomo Medda, Cataldo Musto, Erasmo Purificato.
  • First Workshop on User Perspectives in Human-Centred Artificial Intelligence (HCAI4U) (with E. W. De Luca, E. Purificato, S. Marrone, and C. Sansone), at the 15th Biannual Conference of the Italian SIGCHI Chapter (CHItaly 2023)
  • 4th International Workshop on Algorithmic Bias in Search and Recommendation (Bias 2022) (with S. Faralli, M. Marras, and G. Stilo), at the 45th European Conference on Information Retrieval (ECIR 2023)
  • 3rd International Workshop on Algorithmic Bias in Search and Recommendation (Bias 2022) (with S. Faralli, M. Marras, and G. Stilo), at the 44th European Conference on Information Retrieval (ECIR 2022)
  • 2nd International Workshop on Algorithmic Bias in Search and Recommendation (Bias 2021) (with S. Faralli, M. Marras, and G. Stilo), at the 43rd European Conference on Information Retrieval (ECIR 2021)
  • International Workshop on Algorithmic Bias in Search and Recommendation (Bias 2020) (with S. Faralli, M. Marras, and G. Stilo), at the 42nd European Conference on Information Retrieval (ECIR 2020)
  • Second International Workshop on Knowledge Discovery and User Modeling for Smart Cities (with R. Alzaidy, M.G. Armentano, A. Tommasel, and C.L. Giles), at the European Conference on Machine Learning and Principles and Practice of Knowledge Discovery in Databases (ECML-PKDD 2019)
  • Third Workshop on Social Media for Personalization And Search (SoMePeAS 2019) (with G. Stilo), at the 41th European Conference on Information Retrieval (ECIR 2019)
  • Workshop on Social Interaction-based Recommendation (SIR 2018) (with G. Stilo, C. Morbidoni, and S. Faralli) at the 27th International Conference on Information and Knowledge Management (CIKM 2018)
  • Workshop on Social Aspects in Personalization and Search (SoAPS 2018) (with G. Stilo), at the 40th European Conference on Information Retrieval (ECIR 2018)
  • Second Workshop on Semantics-Enabled Recommender Systems (SERecSys 2017) (with G. Stilo and S. Carta), at the 17th IEEE International Conference on Data Mining (ICDM 2017)
  • Second Workshop on Engineering Human-Computer Interaction in Recommender Systems (with S. Carta and G. Fenu) at the 9th ACM SIGCHI Symposium on Engineering Interactive Computing Systems (EICS 2017)
  • Workshop on Social Media for Personalization And Search (SoMePeAS 2017) (with A. Kaltenbrunner and G. Stilo), at the 39th European Conference on Information Retrieval (ECIR 2017)
  • Workshop on Semantics-Enabled Recommender Systems (SERecSys 2016) (with G. Stilo and S. Carta), at the 16th IEEE International Conference on Data Mining (ICDM 2016)
  • Workshop on Engineering Human-Computer Interaction in Recommender Systems (with L.D. Spano, S. Carta, and G. Fenu), at the 8th ACM SIGCHI Symposium on Engineering Interactive Computing Systems (EICS 2016)

Program Committee (PC) Member

  • ACM SIGKDD Conference on Knowledge Discovery and Data Mining (KDD) – 2019-2022
  • ACM International Conference on Web Search and Data Mining (WSDM) – 2018-2023
  • The ACM Web Conference (WWW) – 2018-2023
  • Annual International ACM SIGIR Conference on Research and Development in Information Retrieval (SIGIR) – 2020-2022
  • IEEE International Conference on Data Mining (ICDM) – 2020-2022
  • ACM Conference on Recommender Systems (RecSys) – 2017-2022
  • ACM Conference on User Modeling, Adaptation and Personalization (UMAP) – 2018-2023
  • International AAAI Conference on Web and Social Media (ICWSM) – 2017-2022
  • International Conference on Information and Knowledge Management (CIKM) – 2020-2022
  • European Conference on Machine Learning and Knowledge Discovery in Databases (ECML-PKDD) – 2020-2022
  • Annual Meeting of the Association for Computational Linguistics (ACL) – 2019-2021
  • International Conference on Intelligent User Interfaces (IUI) – 2017