“…The shifting landscape of human experience has made the subtleties of behavioural traces particularly important: the physical and digital footprints that human behaviour leaves behind are a veritable goldmine of personality data (Lambiotte & Kosinski, 2014). The images that a person chooses to share with others (Burdick, Mihalcea, Boyd, & Pennebaker, 2020; Settanni, Azucar, & Marengo, 2018), a person's words and other features of their verbal behaviour (Boyd et al, 2015; Golbeck, 2016; Hoover, Dehghani, Johnson, Iliev, & Graham, 2018; Kern et al, 2014; Mitra, Counts, & Pennebaker, 2016; Park et al, 2015), URL clicks (Lien, Bai, & Chen, 2019; Tellakat, Boyd, & Pennebaker, 2019), social behaviours (Adali & Golbeck, 2012; Hilbig, Thielmann, Hepp, Klein, & Zettler, 2015), and self‐presentation behaviours (Liu, Preotiuc‐Pietro, Samani, Moghaddam, & Ungar, 2016; Segalin et al, 2017; Shiramizu, Kozma, DeBruine, & Jones, 2019; Todorov et al, 2005; Walker, Schönborn, Greifeneder, & Vetter, 2018) are no longer simply reflections of personality—they are the critical raw material for understanding personality itself.…”