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Système de recommandation sur les plateformes de micro-blogging et bulles filtrantes

Quentin Grossetti 1
1 CEDRIC - ISID - CEDRIC. Ingénierie des Systèmes d'Information et de Décision
CEDRIC - Centre d'études et de recherche en informatique et communications
Abstract : With the unprecedented growth of user-generated content produced on microblogging platforms, finding interesting content for a given user has become a major issue. However due to the intrinsic properties of microblogging systems, such as the volumetry, the short lifetime of posts and the sparsity of interactions between users and content, recommender systems cannot rely on traditional methods, such as collaborative filtering matrix factorization. After a thorough study of a large Twitter dataset, we present a propagation model which relies on homophily to propose post recommendations. Our approach relies on the construction of a similarity graph based on retweet behaviors on top of the Twitter graph. We then conduct experiments on our real dataset to demonstrate the quality and scalability of our method. Finally, we investigate community detection algorithms and we present a metric to compute the strength of the filter bubble. Our results show that filter bubble effects are in fact limited for a majority of users. We find that, counter-intuitively, in most cases recommender systems tend to open users perspectives. However, for some specific users, the bubble effect is noticeable and we propose a model relying on communities to provide a list of recommendations closer to the user’s usage of the platform.
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Quentin Grossetti. Système de recommandation sur les plateformes de micro-blogging et bulles filtrantes. Réseaux sociaux et d'information [cs.SI]. Sorbonne Université, 2018. Français. ⟨NNT : 2018SORUS304⟩. ⟨tel-02868050⟩

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