Investigated the relationship between self-reported (offline) personality traits and (online) self-presentation in social networking profiles on the Internet. Social networking sites like MySpace, Facebook, and StudiVZ are popular means of communicating personality. Recent theoretical and empirical considerations of homepages and Web 2.0 platforms show that impression management is a major motive for actively participating in social networking sites. 58 users (mean age 22.98 years) of the German Web 2.0 site, StudiVZ.net, completed online questionnaires assessing extraversion (NEO Personality Inventory, NEO-FFI), self-esteem (Rosenberg Self-Esteem Scale, RSES), and efficacy of self-presentation, and their profiles were subject to a content analysis. Findings reveal a slight influence of extraversion on self-presentation, whereas there was no significant effect for self-esteem. Moveover, analyses of respondents' profiles showed that self-efficacy with regard to impression management is strongly related to the number of virtual friends, the level of profile detail, and the style of the personal photo.