< Back FIRE: A Modular Framework for Prototyping and Evaluating Interactive Recommender Explanations Ulysse Maes, Cedric Waterschoot, Francesco Barile, and Nava Tintarev. 2026. FIRE: A Modular Framework for Prototyping and Evaluating Interactive Recommender Explanations. In Proceedings of the 34th ACM Conference on User Modeling, Adaptation and Personalization (UMAP '26). Association for Computing Machinery, New York, NY, USA, 484–486. Explanations in recommender systems are important for enhancing transparency, trust, and system understanding. However, as research interest in interactive and chat-based explanations grows, the absence of standardized, reusable interface components limits their systematic evaluation. We introduce the Framework for Interactive Recommender Explanations (FIRE) to bridge this gap. FIRE provides an open-source library of modular explanation styles with varying levels of interactivity — spanning from static lists and draggable charts to conversational agents. To test these modalities in online user studies, FIRE integrates a supporting serverless experiment engine equipped with dynamic routing, crowdsourcing integration, and complete interaction logging. Currently configured for group recommenders but built for broader applicability, FIRE helps to standardize the evaluation of the explanation layer, thereby driving reproducible experimental design. Previous Read the article Next

< Back Public Service Media and Platformization Pieter Van der Elst PhD Researcher This part of the SRP research project aims to develop in-depth knowledge on how an increasingly algorithmized media industry compels European Public Service Media (PSM) to alter their operational and value-related strategies. During a time period of 4 years, we will scrutinize how PSM’s part in the media value chain is affected and what that means for the company, the content and the end-user. A first phase of the research focuses on the organizational side of PSM. More specifically, we concentrate on the case of Flemish public broadcaster VRT and how they are operationalizing a digital and user-first approach in their digital audio strategy. Complementary analysis of the decision-making behind this organizational shift will be key to developing a thorough understanding of what it means for a public legacy media player to adapt to the ever-changing industry it operates in. In later stages of the project, our focus will shift towards what said transition implies for PSM on the levels of content production, distribution and the societal core values imbued. This part of the research will also broaden our scope geographically by including scrutiny of other European PSM organizations and how their methods compare to one another. Examinations of audience perspectives will conclude our research journey and provide us with indispensable insights on the topic. Through this research programme we aim to consolidate our understandings on algorithm-driven media operations and media-economics and media policy oriented PSM-research, not only serve the academic community, but also to provide small market PSM-organizations with tools to better understand and integrate algorithms, and assist policymakers in developing ways of regulating and measuring the impact of algorithms on media output and audience reach. Publications Streaming Europe: How Transnational Streaming is Reshaping European Film and Television Markets Catching the waves: The case of VRT's digital-first audio strategy 02/09/2025 Challenges and requirements for implementing due prominence: aligning stakeholder interests in Flanders 18/07/2025 Towards a Pragmatic Approach for studying Normative Recommender Systems 18/09/2023 Supervisors Catalina Iordache Guest Professor Tim Raats Associate Professor Related news 2 Report Published: How to Ensure Visibility and Prominence for Media Services of General Interest in Flanders Commissioned by the Flemish Minister of Media, this research report investigates findability, discoverability, and due prominence for audiovisual and auditive media services. 2 Ciao from EMMA in Rome! Our presentations at the emma Conference 2025 2 Media Industries Conference, London An overview of our presentations at Media Industries in London Previous Next

< Back Adelaida Afilipoaie Postdoctoral Researcher adelaida.afilipoaie@vub.be I am a senior researcher in the field of media policy, with an affinity for electronic communications networks and services, and online platforms. I am part of the Brussels-based imec-SMIT, Vrije Universiteit Brussel research group, more specifically part of the Media Economics and Policy Unit. In 2016 I graduated from my BA. in Media Studies and Television in the United Kingdom. After gaining theoretical knowledge and hands-on production experience in the media industry, I decided to pursue a MSc. in Communication Studies at the VUB in Brussels from which I graduated in 2018. Right after graduating I started working at imec-SMIT, Vrije Universiteit Brussel, where, by combining economic platform theories and media policy research, I conducted my PhD on the regulatory frameworks at the EU and Member States level, and their ability to address the online platform power concerns, which I finalized in 2023. Currently, I am conducting postdoctoral research for several projects (Fair MusE, ALGEPI and GMICP). Considering the domination of online platforms and their algorithms, these projects tackle the various concerns of the European music ecosystem, the impact of algorithmic gatekeepers on individuals’ epistemic welfare and the media markets concentration trends. When I am not involved in research, I am a guest lecturer for the Digital Media in Europe Master’s programme at the VUB and I act as a master’s thesis supervisor. During my time as a PhD candidate, I acted as a Teaching Assistant for the MSc. course European Media Markets and facilitated several workshops part of the now discontinued Postgraduate in Media Economics programme at the VUB (2018-2020). I have experience with European projects as I was a contributor to the SMART 2018/0066 study on the implementation of the new provisions in the revised Audiovisual Media Services Directive (AVMSD) and CNECT/2020/OP/0099 study on the Media Plurality and Diversity Online, both funded by the European Commission’s DG CNECT. Visit my research profile

< Back Heritiana Ranaivoson Research Professor heritiana.renaud.ranaivoson@vub.be While digital technologies have been here for quite some time already, I am still amazed by the changes they keep triggering in the cultural and media industries and how they allow (or constrain) these industries to innovate. I am particularly interested in the impact these changes have on the diversity of the content these industries produce and recommend. And eventually the policies that are needed in this new environment. I analyse these changes using my background in industrial economics, business modelling and media policy, with a peculiar interest in combining quantitative and qualitative research. I obtained my PhD in Economics (Université Paris 1, Panthéon-Sorbonne) in 2008 on cultural diversity in the recording industry. I also studied Economics and Management at Ecole Normale Supérieure de Cachan (France). Since then, and notably since I joined imec-SMIT-VUB in 2010, I have led several research projects at international and national levels for the European Commission ( H2020 , study contracts ), the Unesco , Google , etc. I have published extensively in the fields of cultural and media diversity , media innovation , media policy, audiovisual platforms , and the economic impact of digital technologies on creative industries . Visit my research profile

< Back Not One News Recommender To Fit Them All: How Different Recommender Strategies Serve Various User Segments Vandenbroucke, H., Maes, U., Michiels, L., & Smets, A. (2025). Not One News Recommender To Fit Them All: How Different Recommender Strategies Serve Various User Segments. In 19th ACM Conference on Recommender Systems Proceedings . ACM. Many news recommender systems (NRS) adopt a one-recommender-for-all approach, overlooking that users engage with news in fundamentally different ways. In this work, we identify user clusters based on various engagement metrics that go beyond clicks by employing cluster analysis on two real-world datasets: EB-NeRD and Adressa. Next to that, we evaluate the performance of common rec-ommender strategies: popularity, collaborative filtering (EASE and ItemKNN), and a content-based model across these user clusters, which exhibit varying reading behaviors and information needs. Our findings show that different recommender strategies are effective to varying degrees depending on the user cluster. This study contributes to NRS research by providing a grounded clustering of users derived from real-world datasets and emphasizes the importance of user-centered evaluations for understanding how NRS strategies serve audiences with varying levels of news engagement. Recommender Systems Previous Read the article Next

< Back Let Me Introduce You: Stimulating Taste-Broadening Serendipity through Song Introductions Brett Binst, Ulysse Maes, Martijn Willemsen, and Annelien Smets. 2026. Let Me Introduce You: Stimulating Taste-Broadening Serendipity through Song Introductions. In 34th ACM Conference on User Modeling, Adaptation and Personalization (UMAP ’26), June 08–11, 2026, Gothenburg, Sweden. ACM, New York, NY, USA, 10 pages. https://doi.org/10.1145/3774935.3806164 Research on how people experience music emphasizes the importance of exploration and diversity in listening. However, music recommender systems struggle with facilitating exploration. Even when music recommender systems are able to recommend something valuable to users that is outside their typical preferences, it still remains difficult to spark their interest. This paper presents a user study examining the efficacy of immersive and informative introductions in stimulating interest in songs that are beyond one’s usual preferences, an experience called Taste-Broadening Serendipity. We uncover two important mechanisms behind the effect of introductions: transportation and cognitive elaboration. Our findings indicate that transportation (i.e., being absorbed into a narrative world) is the strongest predictor of Taste-Broadening Serendipity, while cognitive elaboration (i.e., learning something new about the artist or social context in which the music emerged) has a weaker effect but is easier to stimulate. We propose that song introductions can play an important role in facilitating exploration and increasing diversity of listening on music streaming platforms. Previous Read the article Next

< Back Challenges and opportunities for recommender systems in media markets Ranaivoson, H., Smets, A. & Ballon, P. (2024). Challenges and opportunities for recommender systems in media markets. In U. Rohn, M. Rimscha & T. Raats (Ed.), De Gruyter Handbook of Media Economics (pp. 215-228). Berlin, Boston: De Gruyter. https://doi.org/10.1515/9783110793444-015 Recommender systems have become omnipresent in media markets, fromproduction to distribution and consumption. What is often overlooked, however, isthat the multi-sided nature of contemporary media markets implies that recom-mender systems need to balance the needs and requirements of actors on differentsides of these markets, such as content providers and end-users. Starting from an overview of the rapidly growing literature on recommender systems in media mar-kets, and emphasizing their multi-sided nature, we first describe the main typologies of recommender systems and analyze how various stakeholders might adopt particular strategies to have these systems create novel market opportunities. Then, we discuss media market dilemmas that result from these stakeholders’ often competing objectives in terms of biases, notably filter bubbles, management dilemmas, and is-sues around privacy and transparency. We argue how revisiting these concerns from a multi-stakeholder perspective opens up new angles to understand recommender systems’ impact on contemporary media markets. Recommender Systems Previous Read the article Next

< Back From Experimentation to Strategy: The Ambidextrous Balancing Act of Developing News Recommender Systems Vandenbroucke, H., & Smets, A. (2025). From experimentation to strategy: the ambidextrous balancing act of developing news recommender systems. Journal of Media Business Studies , 1–28. https://doi.org/10.1080/16522354.2025.2590880 Despite advances in news recommender systems (NRS) research, their application in news organisations remains limited, hampered by practical obstacles and organisational challenges. This study applies the multi-stakeholder framework alongside ambidexterity theory to analyse the complex decision-making dynamics in applying NRS within two large commercial news organisations. Based on 11 in-depth interviews with different stakeholders, two “balancing acts” emerged. The first is stakeholder alignment through two strategies: knowledge management with dummy-proof presentations and “showcasing success” to help increase stakeholder buy-in for NRS. The second balancing act is managing trade-offs between exploration and exploitation in a roadmap developed by the multidisciplinary team of product owners (POs), ensuring a balanced allocation of resources for NRS innovation and optimisation. This research shows how organisational ambidexterity supports successful technology integration and provides insights for implementing emerging technologies in complex multi-stakeholder news media environments. Recommender Systems, Stakeholders, Newsmedia Previous Read the article Next

< Back 24 Sept 2024 Our takeaways from the workshop part of the NWO-funded project "Rethinking news algorithms" On 23rd of September, Aina, Hanne, and Ulysse traveled to the Vrije Universiteit Amsterdam for the workshop "Best practices for responsible news recommender design," part of the NWO-funded project "Rethinking news algorithms". This one-day event aimed to foster collaboration between academia and industry, focusing on the ethical design of news recommender systems. Aina and Hanne presented initial insights from their systematic literature review that aims to uncover the organizational challenges, opportunities and social implications of news recommendation systems studied in Western media systems. One significant observation from the day highlighted the challenges in aligning all aspects of responsible news recommenders with diverse stakeholder goals. A key takeaway from our engaging conversations with colleagues and industry professionals is that diversity is frequently considered essential for the development of responsible recommenders, given the close relationship between the democratic function of news and media pluralism. The workshop enabled a cooperative sharing of ideas, fostering the co-creation of optimal strategies for responsible news algorithms. Attendees also pinpointed prospective research paths, underscoring the necessity of ongoing interdisciplinary collaboration to explore the societal implications of these systems. Previous Next Workshop: Best Practices for Responsible News Recommender Design

< Back 28 Oct 2024 Throwback on the international seminar on diversity and VOD services Tim Raats and Catalina Iordache participated in the international seminar on diversity and Video-on-Demand (VOD) services in Madrid, hosted by the Diversidad Audiovisual research group at University Carlos III Madrid. This event brought together scholars, industry experts, and policymakers to discuss the challenges and opportunities for promoting diverse content in the increasingly globalized VOD landscape. Tim Raats contributed to the discussion on quotas for European works, presenting on October 24 during a panel focused on promoting European and Spanish content. His talk examined the importance of quota regulations and content prominence to ensure visibility for European productions, underscoring how these measures can support local cultural diversity on international streaming platforms. Catalina Iordache also presented on the same day, addressing the financial impact of foreign streaming platforms on European fiction series. Speaking in a panel on investment and financing of European works, she shared insights into how international players like Netflix and Amazon Prime are contributing to and reshaping the European audiovisual ecosystem by funding local productions. The seminar recordings and a full list of panels are available on the Diversidad Audiovisual website , offering a wealth of information on the dynamics of diversity in the digital streaming era. Previous Next Diversity in VOD services: Seminar highlights from Madrid

< Back People, personalisation, prominence: A framework for analysing the PSM shift to digital portals and interrogating universality across contexts Iordache, C. et al. (2024). People, personalisation, prominence: A framework for analysing the PSM shift to digital portals and interrogating universality across contexts. International Journal of Cultural Studies. https://doi.org/10.1177/13678779241296556 In the context of enhanced platformisation, Public Service Media (PSM) are once again forced to rethink the ways in which they achieve core public values. To this end, PSM have been prioritising the development of their own video-on-demand portals. To contribute to ongoing research, we propose a theoretical framework that can be applied by future PSM work, based on the operationalisation of platformisation in PSM policy documents and strategy. We identify the shared priorities across ten media organisations in seven media markets: Belgium—Flanders and Wallonia-Brussels, Canada, Denmark, Italy, Poland, and the UK. The study is based on the qualitative analysis of 61 documents, outlining the PSM remit and how they report and present themselves to governments, collaborators, and audiences, contextualised by ongoing national and regional debates. Findings confirm that the framework of people, personalisation, and prominence can serve as a useful theoretical basis for understanding and interrogating universality across contexts. Public Service Media Previous Read the article Next

< Back Beyond rational choice: A typology of urban discovery Binst, B., Michiels, L., & Smets, A. (2026). Beyond rational choice: A typology of urban discovery. Tourism Management , 113 , 105327. As the internet, smartphones, and review platforms transform how travelers discover urban attractions, understanding this process is critical for harnessing a sustainable urban attraction space. Yet urban discovery remains poorly understood, and existing research is fragmented. To address this gap, we adapt Leiper's tourist attraction systems framework to study urban discovery. Our grounded theory analysis on 126 interviews resulted in five distinct discovery modes: instrumental-rational, go-with-the-flow, social, flaneur, and habitual. Besides richly describing these modes, we identify personal, social, contextual, demographic, and affective factors influencing them. We illustrate how playful discovery modes—go-with-the-flow, social, and flaneur—are compatible, leading to mixed discovery modes, while the remaining modes are incompatible. These findings challenge the dominance of rational choice models by revealing a broader spectrum of discovery behaviors. They also provide a foundation for designing a more inclusive urban attraction content space and offer strategic implications for urban attraction management. Previous Read the article Next