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In a series of studies, I investigated the associations between different personality taxonomies (i.e., the Dark Triad traits, the Big Five traits) and objective social media use (i.e., dating apps, Instagram, Facebook). I expanded initial results on the links between dating apps with the Dark Triad traits and the Big Five traits by using facets of the Dark Tetrad traits and the HEXACO traits (the Big Five traits and honesty-humility) to study their link to Instagram and Facebook use. The use of both visual social media, dating apps and Instagram–– but not Facebook––, is associated with dark personality traits indicating a tendency for short-term reproductive benefits. Subsequently, we investigated the relationships of the Dark Triad traits, their latent dark core, and disagreeableness towards sociosexuality. Here, the “dark” traits, but not the “bright” traits were associated with visual social media use and provided incremental validity on top of the dark core. In summary, dark personality traits show connections to several behaviors providing agentic advantages for the individual in the specific environments. All findings are discussed in the light of life-history theory. eingereicht von Lennart Freyth de Polo Abweichender Titel laut Übersetzung der Verfasserin/des Verfassers Dissertation Universität Linz 2023