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In contrast to the prominent individualistic view on self-disclosure, this study focuses on self-disclosure in groups of prior acquaintances that both meet offline and communicate online. It compares within-group self-disclosure between offline face-to-face (FtF) interactions and online communication via mobile messaging applications (MMAs). An online-survey (N = 357) was conducted to test for differences between within-group self-disclosure online and offline across four dimensions (amount, depth, breadth, valence). The results show that there is more amount, more breadth and more depth for offline within-group self-disclosure, but it is less positively valenced than online within-group self-disclosure. Interestingly, the mere frequency of communication is higher in an MMA environment. In spite of the permanent availability of the online communication sphere, group members do not permanently disclose personal …