## 3 The Role of Self-Determination and Self-Disclosure in Users' Privacy
### Privacy and Self-Disclosure  
Self-disclosing parts of users' identities impose additional privacy implications to the ones already in place due to potential online threats. Self-disclosure is the practice of intentionally unveiling personal information about one's identity to another person or an audience; therefore, it is directly related to privacy [62]. A user's true-self is revealed through self-disclosure: the process that makes the self of one user known to others through any online message [16]. Self-disclosure could be perceived as a contradicting notion to privacy, given that it reveals users' personal information as if they are in a constant battle between what users want to reveal and what they want to conceal [16; 53; 62].  
Self-disclosure is necessary to guarantee successful interactions as a tool for \"selective control of access to the self\" [16] (p. 2), determining what is visible to whom and when. It is a prerequisite for establishing social relationships and a necessary step towards building trust and creating social proximity among individuals [12].  
Despite users' needs for representation, managing their privacy is also important. Users' management and setting of boundaries are some of their options for limiting one's access. However, even when measures are taken, the content will be available to the user's \"Friends\" eternally, raising long-term consequences. SM Friends blur the notion of proximity between people, as they signify a wide range of social relationships, from relatives and close friends to colleagues and acquaintances. This vagueness fluctuates the number of Friends from a few to many hundreds [53; 62]. Thus, users may be unaware of their actual self-disclosure on SM because of spontaneous or unconscious communication with their close friends which can easily be susceptible to third parties.  
Setting boundaries and managing one's self-disclosure options can represent users' needs in establishing different types of relationships and control of the repercussions of context and time collapse. As privacy is a dynamic process that requires constant adjustments depending on users' changing needs, managing one's self-disclosure options may prove valuable when handling privacy implications. Privacy is not \"as a process of retreat\", but an effort to accomplish \"different degrees of self-disclosure in different situations\" [62] (p. 150).  
Uncontrollable self-disclosure, unmediated social interactions, and unstoppable sharing of identity traits have been included in the term \"digital crowding\", which triggers potential threats [62]. Apart from the inherent danger when someone discloses too much information about oneself, drawing on the principles of SI Theory, we add the dangers related to the overlapping of social spheres and users' inability to wear the right Face in the right Stage [21]. Audience diversity can perplex users when handling opposing audiences at the same time [53].  
Self-determination and self-disclosure are two distinct notions, yet they can be strongly interrelated. Self-disclosure is presupposed as a means for transmitting users' private information, controlling who will be allowed in and what type of information will be accessible. Self-determination or self-representation refers to the way this information will be handled and consumed.  
Having discussed two crucial notions of digital identity and their implications when managing users' personas, we draw on previous research to proceed in labeling the social aspects which could be beneficial in quantifying the social parameter in the domain of SM.