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PostGage uses a network-based data model that considers the characteristics of publishers, as well as the degree to which the semantic content and lifespan of the posts to be published overlap with those of the posts already published. Leveraging this data model, PostGage builds a multinomial classifier based on a graph neural network (GNN). The alignment between the graph-based data model and the GNN technology allows a precise classification of publishers based on their potential to generate user engagement for target content. This feature enables a more precise definition of publishing strategies on social media, as it allows the selection of the most promising publishers for a given post. The network-based model, the post ageing mechanism and the adoption of the GNN as a multiclass classifier represent PostGage\u2019s key contributions. We also present a series of tests performed on X that demonstrate the high quality of PostGage\u2019s results (e.g. 92% precision in predicting high-engagement posts), establishing it as an invaluable tool for various applications, including marketing and social media management.<\/jats:p>","DOI":"10.1177\/01655515251396879","type":"journal-article","created":{"date-parts":[[2026,1,3]],"date-time":"2026-01-03T10:24:13Z","timestamp":1767435853000},"page":"786-811","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":0,"title":["A multiclass graph neural network\u2013based framework for predicting post engagement in social media"],"prefix":"10.1177","volume":"52","author":[{"given":"Marco","family":"Arazzi","sequence":"first","affiliation":[{"name":"Department of Electrical, Computer and Biomedical Engineering, University of Pavia, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marco","family":"Cotogni","sequence":"additional","affiliation":[{"name":"Department of Electrical, Computer and Biomedical Engineering, University of Pavia, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Antonino","family":"Nocera","sequence":"additional","affiliation":[{"name":"Department of Electrical, Computer and Biomedical Engineering, University of Pavia, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1360-8499","authenticated-orcid":false,"given":"Domenico","family":"Ursino","sequence":"additional","affiliation":[{"name":"DII, Polytechnic University of Marche, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Luca","family":"Virgili","sequence":"additional","affiliation":[{"name":"DII, Polytechnic University of Marche, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2026,1,3]]},"reference":[{"key":"e_1_3_3_2_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.ipm.2019.02.016"},{"key":"e_1_3_3_3_2","doi-asserted-by":"publisher","DOI":"10.1177\/0165551520944352"},{"key":"e_1_3_3_4_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.jmsy.2022.07.010"},{"key":"e_1_3_3_5_2","doi-asserted-by":"publisher","DOI":"10.1109\/MWC.009.2100570"},{"key":"e_1_3_3_6_2","doi-asserted-by":"publisher","DOI":"10.1177\/01655515221074325"},{"key":"e_1_3_3_7_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.jmsy.2021.10.006"},{"key":"e_1_3_3_8_2","doi-asserted-by":"publisher","DOI":"10.1177\/0165551519866544"},{"key":"e_1_3_3_9_2","doi-asserted-by":"publisher","DOI":"10.1177\/01655515241281313"},{"key":"e_1_3_3_10_2","doi-asserted-by":"publisher","DOI":"10.1145\/3394486.3403305"},{"key":"e_1_3_3_11_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.intmar.2020.05.001"},{"key":"e_1_3_3_12_2","doi-asserted-by":"publisher","DOI":"10.1108\/EJM-10-2017-0772"},{"key":"e_1_3_3_13_2","doi-asserted-by":"publisher","DOI":"10.1177\/0165551520979869"},{"key":"e_1_3_3_14_2","doi-asserted-by":"publisher","DOI":"10.4018\/JOEUC.2016040104"},{"key":"e_1_3_3_15_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.intmar.2020.06.002"},{"key":"e_1_3_3_16_2","doi-asserted-by":"crossref","first-page":"41","DOI":"10.1145\/2668067.2668072","volume-title":"Proceedings of the recommender systems challenge (RecSys\u201914)","author":"Diaz-Aviles E","year":"2014","unstructured":"Diaz-Aviles E, Lam HT, Pinelli F, et al. 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