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Home / Proceedings / Proceedings of the International AAAI Conference on Web and Social Media

Exposure Inequality in People Recommender Systems: The Long-Term Effects

February 1, 2023

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Authors

Francesco Fabbri,Maria Luisa Croci,Francesco Bonchi,Carlos Castillo

Pompeu Fabra University, Barcelona, Spain Eurecat, Barcelona, Spain,Sapienza, University of Rome, Italy,Centai, Turin, Italy Eurecat, Barcelona, Spain,Pompeu Fabra University, Barcelona, Spain ICREA, Barcelona, Spain


DOI:

10.1609/icwsm.v16i1.19284


Abstract:

People recommender systems may affect the exposure that users receive in social networking platforms, influencing attention dynamics and potentially strengthening pre-existing inequalities that disproportionately affect certain groups. In this paper we introduce a model to simulate the feedback loop created by multiple rounds of interactions between users and a link recommender in a social network. This allows us to study the long-term consequences of those particular recommendation algorithms. Our model is equipped with several parameters to control: (i) the level of homophily in the network, (ii) the relative size of the groups, (iii) the choice among several state-of-the-art link recommenders, and (iv) the choice among three different stochastic user behavior models, that decide which recommendations are accepted or rejected. Our extensive experimentation with the proposed model shows that a minority group, if homophilic enough, can get a disproportionate advantage in exposure from all link recommenders. Instead, when it is heterophilic, it gets underexposed. Moreover, while the homophily level of the minority affects the speed of the growth of the disparate exposure, the relative size of the minority affects the magnitude of the effect. Finally, link recommenders strengthen exposure inequalities at the individual level, exacerbating the“rich-get-richer” effect: this happens for both the minority and the majority class and independently of their level of homophily.

Topics: ICWSM

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HOW TO CITE:

Francesco Fabbri,Maria Luisa Croci,Francesco Bonchi,Carlos Castillo Exposure Inequality in People Recommender Systems: The Long-Term Effects Proceedings of the International AAAI Conference on Web and Social Media (2022) 194-204.

Francesco Fabbri,Maria Luisa Croci,Francesco Bonchi,Carlos Castillo Exposure Inequality in People Recommender Systems: The Long-Term Effects ICWSM 2022, 194-204.

Francesco Fabbri,Maria Luisa Croci,Francesco Bonchi,Carlos Castillo (2022). Exposure Inequality in People Recommender Systems: The Long-Term Effects. Proceedings of the International AAAI Conference on Web and Social Media, 194-204.

Francesco Fabbri,Maria Luisa Croci,Francesco Bonchi,Carlos Castillo. Exposure Inequality in People Recommender Systems: The Long-Term Effects. Proceedings of the International AAAI Conference on Web and Social Media 2022 p.194-204.

Francesco Fabbri,Maria Luisa Croci,Francesco Bonchi,Carlos Castillo. 2022. Exposure Inequality in People Recommender Systems: The Long-Term Effects. "Proceedings of the International AAAI Conference on Web and Social Media". 194-204.

Francesco Fabbri,Maria Luisa Croci,Francesco Bonchi,Carlos Castillo. (2022) "Exposure Inequality in People Recommender Systems: The Long-Term Effects", Proceedings of the International AAAI Conference on Web and Social Media, p.194-204

Francesco Fabbri,Maria Luisa Croci,Francesco Bonchi,Carlos Castillo, "Exposure Inequality in People Recommender Systems: The Long-Term Effects", ICWSM, p.194-204, 2022.

Francesco Fabbri,Maria Luisa Croci,Francesco Bonchi,Carlos Castillo. "Exposure Inequality in People Recommender Systems: The Long-Term Effects". Proceedings of the International AAAI Conference on Web and Social Media, 2022, p.194-204.

Francesco Fabbri,Maria Luisa Croci,Francesco Bonchi,Carlos Castillo. "Exposure Inequality in People Recommender Systems: The Long-Term Effects". Proceedings of the International AAAI Conference on Web and Social Media, (2022): 194-204.

Francesco Fabbri,Maria Luisa Croci,Francesco Bonchi,Carlos Castillo. Exposure Inequality in People Recommender Systems: The Long-Term Effects. ICWSM[Internet]. 2022[cited 2023]; 194-204.


ISSN: 2334-0770


Published by AAAI Press, Palo Alto, California USA
Copyright 2022, Association for the Advancement of
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