Zoekresultaten

< 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 GenUI(ne) CRS: UI Elements and Retrieval-Augmented Generation in Conversational Recommender Systems with LLMs Maes, U. , Michiels, L. & Smets, A. , (8 Oct 2024). GenUI(ne) CRS: UI Elements and Retrieval-Augmented Generation in Conversational Recommender Systems with LLMs. Proceedings of the 18th ACM Conference on Recommender Systems. Bari: ACM , p. 1177-1179 Previous research has used Large Language Models (LLMs) to develop personalized Conversational Recommender Systems (CRS) with text-based user interfaces (UIs). However, the potential of LLMs to generate interactive graphical elements that enhance user experience remains largely unexplored. To address this gap, we introduce "GenUI(ne) CRS," a novel framework designed to leverage LLMs for adaptive and interactive UIs. Our framework supports domain-specific graphical elements such as buttons and cards, in addition to text-based inputs. It also addresses the common LLM issue of outdated knowledge, known as the "knowledge cut-off," by implementing Retrieval-Augmented Generation (RAG). To illustrate its potential, we developed a prototype movie CRS. This work demonstrates the feasibility of LLM-powered interactive UIs and paves the way for future CRS research, including user experience validation, transparent explanations, and addressing LLM biases. Recommender Systems Previous Read the article Next

< Back Media Industries Conference, London 19 Apr 2024 An overview of our presentations at Media Industries in London From April 16 to 19, 2024, the Media Industries Conference took place at King’s College London. Our SRPMedia team was well represented with presentations related to our doctoral research tracks on news recommenders and public service media , our living lab project on streaming affordances in small media markets , and presentations on the ALGEPI and PSM-AP projects. Last but not least, the De Gruyter Handbook of Media Economics was presented, which contains several contributions from our team and is co-edited by Tim Raats. In this post, we provide an overview of the various presentations delivered by our team. Integrating Recommenders and Platformization in Small Media Markets’ Legacy Players In our presentation we offered insightful perspectives on navigating the challenges and opportunities within the evolving media landscape in Flanders. From exploring streaming and recommender systems in Flemish media to analyzing the importance of scalability in small markets. The Flemish public service media VRT has been working to establish a strong central brand with content brands inspired by findability. They are challenged to reclaim control over their audiences, rather than have to rely on third parties (like social media) to reach audiences. In their distribution strategy they adopt a 50% human, manual curated, and 50% curation by algorithms both for audio and video taking into account contextual factors for example offer a podcast in the morning and user is in the car, but entertainment or series when user is at home watching on TV. VRT chooses taste-broadening as way to go by recommending unconsumed content that is deemed to be in range of consumers interest, but still diverse enough. Additionally, we question the value of news recommender systems by examining the return on investment for commercial news organizations. Finally, the findings from the diary study show that the social aspect remains relevant even with the rise of VOD services, with viewing giving a sense of community. Also while SVOD services provide personalized interfaces, local BVOD services seem to function more as generic content collections with limited navigation support. Gatekeeping in the Digital Age: Newsroom Resistance to News Personalization? Aina Errando shared some valuable insights from her research, conducted in collaboration with Heritiana Ranaivoson and Adelaida Afilipoaie as part of the ALGEPI project . Their presentation highlighted the current challenges in implementing News Recommender Systems (NRS) in Spanish newsrooms, emphasizing the importance of bridging “tech-editorial gaps” and promoting collaboration among stakeholders within news organizations. Platformization Meets Universality Catalina Iordache presented insights from the comparative policy analysis of the platformization process of public service media (PSM) in seven media markets, as part of the PSM-AP project. Findings show a wide range of priorities set in the policy documents and digital strategies of PSM organizations, with a focus on People--connecting to and with audiences, Personalization - the use of recommender systems and the development of (public service) algorithms, and Prominence - with regard to PSM services/apps, content, and brands. Universality remains a core principle in the formulation of online strategies and regulatory recommendations. De Gruyter Handbook of Media Economics During a roundtable the new Handbook of Media Economics was presented, edited by Ulrike Rohn , M. Bjørn von Rimscha and Tim Raats . The handbook presents key contributions from scholars worldwide, providing a comprehensive exploration of current trends in media industries from diverse perspectives. Within the framework of understanding contemporary and future trajectories in media markets and industries, the volume delves into their influence on media organization and delivery, along with broader societal and market implications. Encompassing research at the crossroads of economics, management, political economy, and production studies, the handbook emphasizes the necessity for a robust interdisciplinary dialogue. Beyond scrutinizing present and forthcoming industry developments, the handbook addresses pivotal issues pertaining to media economics research methods and pedagogy. It serves as a valuable resource for scholars, students, and media professionals, providing insights into media economics as an academic field and delving into the multifaceted dynamics that shape the media landscape. Doing this, it contributes to the ongoing discourse on the evolving nature of media markets and their profound impact on society. The handbook is co-edited by Tim Raats and contains the following contributions from our team: Tim Raats, Developing a curriculum for media economics Alessandro D’Arma, Jeanette Steemers & Tim Raats, Public service media: Challenges for delivering universal public service in the platform age Catalina Iordache, The effects of streaming on media markets Heritiana Ranaivoson, Annelien Smets,& Pieter Ballon, Challenges and opportunities for recommender systems in media markets De Gruyter Handbook on Media Economics will be published on 20 May, 2024. Previous Next

< Back Pieter Ballon Full Professor pieter.ballon@vub.be Professor Pieter Ballon is Professor in the Department of Communication Sciences, director of imec-SMIT and Vice-Rector of Research at the Vrije Universiteit Brussel. He is also co-founder of the European Network of Living Labs and of the Hannah Arendt Institute. Prof. Ballon holds a PhD in Communication Sciences and an MA in Modern History. He is the co-founder of the European Network of Living Labs, the Open Agile Smart Cities network and the Hannah Arendt Institute. From 2017 to 2021, he was the VUB Academic Chair on Smart Cities. His expertise lies in Digital Platforms, Business Model Innovation and Smart Cities, on the subject of which he has a.o. published the popular book “Smart Cities : hoe technologie onze steden leefbaar houdt en slimmer maakt” . Visit my research profile

< Back Aina Errando PhD Researcher aina.errando@vub.be With a background in journalism, she has studied a master’s degree in Political Science: International and European Governance (VUB), an Advanced Master’s in European Integration (BSOG), and a Master’s in Digital and Data Journalism (Nebrija Univeristy). As a PhD researcher in the ALGEPI project (understanding ALGorithmic gatekeepers to promote EPIstemic welfare), she works analysing some of the most pressing challenges facing the media industry today. Her research focuses on algorithmic gatekeepers and media strategies, exploring why and how algorithms are designed to fit and influence media consumption. In an algorithmic media environment, it is crucial to understand which mechanisms help retain or regain trust in media as well as to assess how algorithmic gatekeepers can contribute to or hinder media diversity. Visit my research profile

< Back A glimpse into our work-in-progress 12 Feb 2024 Reflections on the research presented at Etmaal On Thursday 8th and Friday 9th February 2024, Hanne Vandenbroucke and Ulysse Maes attended the 26th edition of Etmaal van Communicatiewetenschap in Rotterdam. At this two-day conference, researchers from Communication Sciences in Belgium and The Netherlands unite to present their projects, get feedback from peers, and be inspired by the work of others. They were invited to present their work-in-progress during the Research Escalator. In this blogpost we highlight the key take-aways from their presentations. Multi-stakeholder approach to news personalization - Hanne Vandenbroucke What lies behind the "For you", "Read more" or "See also" sections on the website or mobile app of your favorite news brand? By conducting stakeholder interviews with professionals working in commercial news organizations operating in Flanders: DPG Media, Mediahuis and Mediafin; We aim to map the development and implementation of recommender systems. The key internal stakeholder groups involved in and impacted by news recommender systems are: (1) the newsroom, (2) the technical development, and (3) the commercial business unit. Based on the stakeholder interviews, we are able to build upon the multi-stakeholder framework of Smets et al. (2022) . The preliminary results give insights in the actual decision-making process for recommender development. News organisations started experimenting with a news recommender system on average 3 years ago. The initial process of trial and error had transformed into an ongoing cycle of adjusting the RS design. In practice both the newsroom and the business unit express their objectives, preconditions and concerns to the product owner who aligns the different perspectives and formulates a concrete set of goals. Next, the technology development team will operationalize these objectives into computational metrics and adjust the recommender system design. Performance data is continuously being collected and monitored. A feedback loop set up to communicate the results of the adjusted recommender to the product owner who – together with the data analytics team – derives insights from the data and report back to the business unit and newsrooms. Exploring the influence of misleading explanations on the perceived quality of recommender systems – Ulysse Maes Nowadays, recommender systems are everywhere: you find them on Amazon, on Netflix and Spotify, for example. These algorithmic curation systems help internet users to efficiently navigate through vast amounts of content. While holding clear advantages in terms of user experience, there are some limitations and normative concerns. One of these concerns stems from the limited transparency they provide. This may lead to distrust and frustration. Adding explanations may yield different results, which depend on your objectives. (Tintarev & Masthoff, 2007) suggest seven goals of explainable recommendations: effectiveness, efficiency, satisfaction, scrutability, transparency, trust, and persuasiveness. Note that maximizing for one goal might be beneficial for another (e.g. improving for scrutability- giving users the ability to change the outcomes to their liking- might improve satisfaction). However, optimizing for one goal might also harm other goals. This research specificially dives into the possible conflict between optimizing for persuasiveness and its effects on transparency and trust. By “optimizing for persuasiveness”, we mean creating compelling narratives to persuade users to consume recommended content. For example, when you buy a pair of jeans online, the shop can try to upsell by recommending some white t-shirts and explain the recommendations as “Style advice for the perfect shirt to wear on your new jeans.” A more neutral explanation could be: “Customers also bought.” Persuasion in itself is not problematic, but it might become problematic once it becomes misleading: hiding important information or even lying about the working of the system, or the drivers behind a decision. As explanations are often linked to a conception of transparency, both with end-users and academia, the mere presence of explanations can already lead to increased trust in the system. By crafting compelling but incorrect explanations, it might be possible to manipulate users into consuming certain content, while still giving them a feeling of agency. There are clearly some incentives to create misleading explanations. But do they work? Theory is still inconclusive. While some research mentions the effectiveness of personalized persuasion (Burtell & Woodside, 2023), others highlight the detrimental effects on long-term trust: would platforms really jeopardize this? Another argument against the effectiveness of misleading explanations is that the costs don’t outweigh the benefits – a critique sometimes formulated on explanations in general as well. The field of explainable AI recognizes the immense potential of Large Language Models (LLMs), such as ChatGPT, to generate personalized, dynamic explanations at scale. It has already been shown that these explanations can be more persuasive than human-generated texts. One of the reasons why we do not see LLM-generated explanations popping up everywhere, is because of their tendency to “hallucinate” - to make up plausible, but incorrect narratives. Previous Next

< Back News Recommenders in Small Media Markets Hanne Vandenbroucke PhD Researcher In a four-year doctoral journey, my research delves into the implementation of recommender systems within news organizations through the lens of media strategies. This comprehensive exploration is divided into two key phases, addressing distinct facets of this transformative technological landscape. 1. Strategic Decision-Making Processes The initial phase of my research centers on unraveling the strategic decision-making processes in the development and implementation of recommender systems within news organizations. Drawing on a multi-stakeholder and multi-objectives framework, scrutinizing the complexities surrounding the strategies in commercial news organizations. From a multi-stakeholder perspective, this research identifies diverse entities such as newsrooms, technology departments, and marketing teams, each holding unique objectives and values. This framework allows to dissect conflicts, trade-offs, and (mis)conceptions that shape the strategic landscape, offering insights into how recommender systems align with overarching organizational goals. 2. User Journeys and Experiences In a second phase the focus shifts towards a user-centric perspective. This stage of the research aims to map user journeys and experiences and examine the added value brought about by recommender systems in the realm of news consumption. By closely examining interaction touchpoints, user preferences, and experiences, I seek to uncover the nuanced ways in which recommender systems influence and enhance the user journey. This comprehensive, dual-phased approach reflects the goal of this PhD to comprehensively understand the role of recommender systems in news organizations. By blending strategic decision-making perspectives with an in-depth exploration of user experiences, my research aims to not only contribute to the academic discourse surrounding media strategies but also offer actionable insights for news organizations navigating the dynamic landscape of digital news consumption. Publications Not One News Recommender To Fit Them All: How Different Recommender Strategies Serve Various User Segments It’s (Not) All About That CTR: a Multi-Stakeholder Perspective on News Recommender Metrics 01/09/2024 Towards a Pragmatic Approach for studying Normative Recommender Systems 18/09/2023 Supervisors Pieter Ballon Full Professor Annelien Smets Research Professor Related news 2 Ciao from EMMA in Rome! Our presentations at the emma Conference 2025 2 Talking about Stakeholder Perspectives at WMEMC Hanne presented her research on stakeholder alignment for news recommender system development 2 Second Annual ALGEPI Workshop Insights on AI, Innovation and Media Regulation Previous Next

< Back Media policymaking and multistakeholder involvement: Matching audience, stakeholder and government expectations for public service media in Flanders Van den Bulck, H. & Raats, T. (2023). Media policymaking and multistakeholder involvement: Matching audience, stakeholder and government expectations for public service media in Flanders. European Journal of Communication , 38 (2), 132-147. https://doi.org/10.1177/02673231221112199 This contribution analyzes government, opposition, public service media, media stakeholders and audience views regarding the role and remit of public service media in the run-up to and their impact on the renewal of the 2021–2025 management contract between public broadcaster VRT and the Flemish Government. Results show that, despite a shifting media ecosystem and academics and government pushing for fundamental reform, audiences and most stakeholders’ views stick to a centralised, broad and multiplatform public media institution. Moreover, they expect public service media to solve ever more media and societal issues (e.g. fake news) within a shrinking budget. The case illustrates how mature, evidence-based multistakeholderism pushes public service media to meet an increasingly challenging set of expectations, hampers both public service media and government to build a well-balanced, long-term vision of public service media's role and, instead, pushes them to pursue their own agenda. Lastly, an evidence-based process also suffers from issues of validity of the data. Stakeholders, Platforms, Public Service Media Previous Read the article Next

< Back New publication: NORMalize Workshop (@ RecSys23) 15 Sept 2023 Exploring Power Dynamics in Digital Platform Markets: A Pragmatic Approach to Normative Recommender Systems We are excited to share that our research team has contributed a paper to the first workshop on Normative Design and Evaluation of Recommender Systems (NORMalize), co-located with the 17th ACM Conference on Recommender Systems in Singapore. Our paper, titled "Towards a Pragmatic Approach for studying Normative Recommender Systems: exploring Power Dynamics in Digital Platform Markets" examines two key economic dynamics prevalent in digital media markets that challenge the development of normative RSs. The first hurdle focuses on the susceptibility of digital platforms to lock-in and monopolization due to network effects, skewing the power balance towards system providers. The second hurdle delves into the "attention economy" and the engagement-centric logic in RS design. This logic, while successful in boosting engagement, might compete with explicit or long-term user objectives We illustrate the real-world significance of these dynamic with insights from the domains of video-on-demand and news media. Furthermore, by offering policy recommendations we wish to address the normative challenges that arise in RS design. PhD researcher Hanne Vandenbroucke will be presenting this paper during the NORMalize workshop on Tuesday, September 19. Previous Next

< Back Looking back at RecSys 2024 23 Oct 2024 Sharing our reflections on the ACM RecSys Conference 2024 Some researchers of the SRP Media team recently attended the 18th ACM Conference on Recommender Systems (RecSys 2024) in Bari, Italy. Known for its stunning coastline and sunny weather, Bari provided the perfect backdrop for a gathering of both academic and industry experts in recommender systems. Beyond indulging in the delicious Italian cuisine and navigating the city’s chaotic traffic, our team traveled to Bari to share our latest research, gain insights from the inspiring talks, and engage with the Recsys community. SRP Media's Contributions at RecSys 2024 A previous blog post already summarizes all of the SRP Media team's contributions to the conference. Annelien and Lien each gave a learning session at the RecSys Summer School, which took place the week before the conference. Ulysse attended the Summer School and then stayed another week in beautiful Bari to present a demo poster at the conference. During the conference, Brett participated in the doctoral symposium, where he presented his initial findings and received valuable feedback from leading experts. In addition, there was also a poster for Hanne and Annelien's paper which got shortlisted for the Best Short Paper Award! The RecSys Summer School: Gaining Insights Although RecSys 2024 officially kicked off on October 14th, some of our team members arrived in Bari a week early to attend the ACM Europe School on Recommender Systems. On the program there was Lien Michiels 's lecture on Best Practices for Offline Evaluation and Annelien Smets ' course on Digital Economics and Recommender Systems . Their insights offered a refreshing perspective amidst the buzz around transformer-based algorithms. Ulysse, as a participant in the Summer School, had the chance to connect with fellow researchers from around the world, fostering an environment of collaboration and learning. The Main Conference: Workshops, Presentations, and Keynotes The RecSys conference consists of two parts: on Monday and Friday, a series of workshops and presentations took place at the Politecnico University of Bari. From Tuesday to Thursday, the main track continues with an extensive program of lectures, presentations and posters at the magnificent Teatro Petruzzelli. Some of our highlights: Ulysse's highlights For Ulysse, one of the standout moments was the CARS workshop led by Dr. Rishabh Mehrotra from Sourcegraph. Drawing on his experience at Spotify, Dr. Mehrotra presented a thorough analysis of eight real-world recommendation challenges, offering invaluable insights into the practical applications of recommendation systems. Ulysse also appreciated a keynote from Mounia Lalmas, also from Spotify, as well as events like the Women in RecSys session, the Normalize workshop, and Netflix’s “Raising a Recommender System”—although his duties as a student volunteer required him to follow these online. Brett's reflections Brett's experience at the doctoral symposium was the outstanding highlight of the week. Thanks to valuable feedback from experts such as Julia Neidhardt, Markus Zanger and Bart Knijnenburg, Brett gained new clarity on his PhD project, particularly his development of the "Serendiptionnaire" a tool designed to evaluate how recommender systems promote serendipity. Throughout the main track, Brett found himself both impressed and challenged by the industry presence. While captivated by the venue and delighted by the food, he noted a strong focus on technical issues, which sometimes overshadowed a more human-centered approach. Mark Riedl’s keynote resonated with this perspective, particularly the idea that recommender systems should enhance user agency. Workshops like RecSoGood, AltRec , and the POPROX project emphasizing the importance of considering the societal implications of research on recommender system. Hanne’s first RecSys Attending the RecSys Conference in person for the first time was an exciting and enriching experience. The conference brings together researchers and industry practitioners from a wide range of sectors, creating a vibrant and open-minded community. The empowerment of women in this traditionally male-dominated field, with the Women in RecSys breakfast and session is very valuable to facilitate connections. Her own contribution, a short paper titled “It’s (not) all about that CTR: A Multi-stakeholder Perspective on News Recommender Metrics” was shortlisted for the Best Short Paper award. This nomination, together with the encouraging feedback on the poster, is a testament to the importance of interdisciplinary approaches in recommender system research. The need for bridging the gap between academia and industry echoed throughout the week. Final Thoughts: A Rich Exchange of Ideas and Inspiration RecSys 2024 in Bari offered not only an incredible learning experience but also an opportunity to engage with great minds in the Recsys field. From insightful workshops and keynotes to helpful feedback and new connections, our team left the conference feeling motivated and inspired. As we look ahead, the key takeaway is clear: recommender systems must evolve beyond technical optimization. The importance of fostering user agency, promoting social sciences in the research on recommenders, and bridging the gap between academia and industry applications is more pressing than ever. Previous Next

< Back Report Published: How to Ensure Visibility and Prominence for Media Services of General Interest in Flanders 15 Jul 2025 Commissioned by the Flemish Minister of Media, this research report investigates findability, discoverability, and due prominence for audiovisual and auditive media services. We’re pleased to announce that the study conducted by Prof. Dr. Tim Raats , Dr. Adelaida Afilipoaie , Pieter Van der Elst , and Noëmie Forest for the Flemish Minister of Media and the Department of Culture, Youth and Media has now been officially published. The report, titled Study on appropriate prominence, visibility and findability for audiovisual and auditive media services of general interest in Flanders , is now available via the Department’s website. 📄 Read the full study (in Dutch) here: 👉 https://www.vlaanderen.be/publicaties/studie-omtrent-passende-aandacht-zichtbaarheid-en-vindbaarheid-voor-audiovisuele-en-auditieve-mediadiensten-van-algemeen-belang-in-vlaanderen The study addresses a pressing policy question: How can we ensure that audiovisual and audio media services of general interest remain findable, discoverable, and appropriately prominent in the digital media environment — and what additional policy measures might be needed in Flanders to achieve this? As part of our academic work on media policy and platform regulation, we developed this research as a contribution to the Flemish media policy agenda. The report: Maps the current Flemish landscape on the matter Compares with international practices and emerging regulatory approaches across Europe And formulates recommendations for a future-proof policy framework . We’re also pleased to see that the report has already had direct policy impact : it served as a reference work for the Department in drafting new plans around prominence and findability, which were approved by the Flemish Government in early July . These plans make Flanders one of the first smaller media markets in the EU to introduce a legal framework explicitly addressing prominence for media services of general interest — a notable development in the implementation of Article 7a of the EU Audiovisual Media Services Directive (AVMSD). This project reflects the broader media policy research of our SRP Media team at imec-SMIT. An academic publication on the topic of due prominence for media services of general interest — authored by Pieter, Adelaida, and Tim as part of Pieter’s ongoing PhD research on the platformization of public service media — is also forthcoming. Stay Tuned! https://www.srpmedia.be/team/adelaida-afilipoaie Previous Next

< Back Platforms and Exposure Diversity: Towards a Framework to Assess Policies to Promote Exposure Diversity Ranaivoson, H. R., & Domazetovikj, N. (2023). Platforms and Exposure Diversity: Towards a Framework to Assess Policies to Promote Exposure Diversity. Media and Communication , 11 (2), 379-391. https://doi.org/10.17645/mac.v11i2.6401 The fragmentation of consumption and algorithms’ increasing impact on how content is recommended and displayed makes it even more important to analyse and promote exposure diversity, i.e., the extent to which audiences are exposed to, discover, and engage with diverse content. Although there is a growing literature addressing how to define media diversity in the context of the challenges posed by platformisation, this article translates the normative dimensions into a framework for operationalising exposure diversity into a tangible policy goal, taking into account datafication and its consequences in terms of increasing data requirements towards platforms. The main objective of this study is to analyse initiatives to assess exposure diversity in the platform era and to discuss how such assessment could be improved, particu‐ larly for policy initiatives. This involves addressing several challenges of existing approaches for the assessment of exposure diversity related to defining an appropriate frame of reference, determining the degree of diversity required, dealing with data transparency issues, and promoting user autonomy. To achieve this, we propose a framework for analysing initiatives aimed at assessing and promoting exposure to media diversity. Our framework is composed of four key features: measures (type of initiative), metrics (quantifying exposure diversity), data collection methods, and data requirements. We apply this framework to a set of 13 initiatives and find that policy initiatives can benefit from adopting metrics based on distances and experimenting with data collection methods. Platforms Previous Read the article Next