RT Journal Article T1 Facebook use and chronotype: Results of a cross-sectional study A1 Blachnio, Agata A1 Przepiorka, Aneta A1 Díaz Morales, Juan Francisco AB Facebook has become the most popular social networking site round the world. In seeking an explanation for this phenomenon, individual differences in circadian functioning seem to be an interesting issue. The main aim of this study was to examine the potential associations between morningness/eveningness and Facebook use (intrusion and intensity). The participants were 663 Facebook users. The Facebook Intrusion Questionnaire, Facebook Intensity Scale and the Composite Scale of Morningness were used. Our results indicate that chronotype is negatively related with Facebook usage. Eveningness people use Facebook intensively and their Facebook use is more intrusive. Moreover, eveningness in combination with young age predicted Facebook intensity. PB Taylor and Francis SN 0742-0528 YR 2015 FD 2015-10-27 LK https://hdl.handle.net/20.500.14352/123556 UL https://hdl.handle.net/20.500.14352/123556 LA eng NO Blachnio, A., Przepiorka, A., & Díaz-Morales, J. F. (2015). Facebook use and chronotype: Results of a cross-sectional study. Chronobiology International, 32(9), 1315-1319. https://doi.org/10.3109/07420528.2015.1083998 NO This work was supported by the National Science Centre [grant number OPUS nr 2014/15/B/HS6/03129] NO Ministerio de Economía y Competitividad (España) NO Foundation for Polish Science NO National Science Centre (Poland) DS Docta Complutense RD 7 sept 2025