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Standard collaborative filtering algorithms by design often lead to a certain level of discovery. Nonetheless, in certain domains, it may be helpful to more actively promote content to users beyond their past preference profile (\u201coff-profile\u201d) and thereby help users explore new content. However, when showing such off-profile content to users in combination with more familiar content, the new content items may be overlooked. In this research, we explore to what extent<jats:italic>digital nudging<\/jats:italic>, i.e., subtly directing user choices in a specific direction, can help to raise the attention and interest of users for off-profile content. We conducted a user study (<jats:inline-formula><jats:alternatives><jats:tex-math>$$N=1064$$<\/jats:tex-math><mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><mml:mrow><mml:mi>N<\/mml:mi><mml:mo>=<\/mml:mo><mml:mn>1064<\/mml:mn><\/mml:mrow><\/mml:math><\/jats:alternatives><\/jats:inline-formula>) on a real-world social book recommendation app. We find that users who are nudged towards recommended books of their non-preferred genres significantly more often put these off-profile books on their reading lists, thus confirming the effectiveness of digital nudging in this application. However, we also found that digital nudges may negatively impact the users\u2019 beliefs and attitudes towards the system and a more limited intention to use the system in the future. As a result, we find that digital nudging in recommendations, while effective in the short run, must be done with due care, keeping an eye on the overall quality perceptions by users and potentially harmful long-term effects.<\/jats:p>","DOI":"10.1007\/s11257-023-09378-7","type":"journal-article","created":{"date-parts":[[2023,10,4]],"date-time":"2023-10-04T10:01:57Z","timestamp":1696413717000},"page":"441-481","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Digitally nudging users to explore off-profile recommendations: here be dragons"],"prefix":"10.1007","volume":"34","author":[{"given":"Gabrielle","family":"Alves","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dietmar","family":"Jannach","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rodrigo Ferrari","family":"de Souza","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daniela","family":"Damian","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marcelo Garcia","family":"Manzato","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2023,10,4]]},"reference":[{"key":"9378_CR1","doi-asserted-by":"publisher","first-page":"676","DOI":"10.1186\/s12889-016-3272-x","volume":"16","author":"A Arno","year":"2016","unstructured":"Arno, A., Thomas, S.: The efficacy of nudge theory strategies in influencing adult dietary behaviour: a systematic review and meta-analysis. 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