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However, implementing such interventions is challenging due to transparency concerns and the lack of ground-truth behavioral data from expert psychologists. Interpretability is crucial for addressing these challenges, as it enables platforms to tailor moderation strategies while ensuring fairness and user trust. In this paper, we present an unsupervised, data-driven framework to build an interpretable predictive model capable of distinguishing between toxic and non-toxic users with different personality traits. We leverage personality representations from an external resource to uncover behavioral profiles through clustering, utilizing embeddings of both toxic and non-toxic users. Then, we model users with features capturing linguistic and affective dimensions, training an interpretable personality detector capable of distinguishing between behavioral profiles in a transparent and explainable manner. A case study on Reddit demonstrates the effectiveness of our approach, highlighting how an interpretable model can achieve competitive performance comparable to a black-box alternative while offering meaningful insights into toxic and non-toxic users behavior.<\/jats:p>","DOI":"10.1007\/978-3-032-08327-2_8","type":"book-chapter","created":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T18:06:56Z","timestamp":1760206016000},"page":"162-179","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Unsupervised and\u00a0Interpretable Detection of\u00a0User Personalities in\u00a0Online Social Networks"],"prefix":"10.1007","author":[{"ORCID":"https:\/\/orcid.org\/0009-0003-5043-5942","authenticated-orcid":false,"given":"Alessio","family":"Cascione","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9914-1943","authenticated-orcid":false,"given":"Laura","family":"Pollacci","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2827-7613","authenticated-orcid":false,"given":"Riccardo","family":"Guidotti","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2025,10,12]]},"reference":[{"key":"8_CR1","unstructured":"API, P.: Scores \u2013 choosing thresholds: Research (nd) (2025). https:\/\/developers.perspectiveapi.com\/s\/about-the-api-score?language=en_US. 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