## 2 Materials and Methods
### Privacy Management  
Considering that previous privacy metrics could be further exploited from expansion in many ways [28], while the combination of their advantages may elevate the examination of self- adaptive privacy within SNs, this section is consisting of nine sub-scales, adopted from previous literature. It aims at including as much as possible privacy-related metrics, in order to reflect users' privacy context within SNs in depth. The participants were asked to rate their agreement on a 5-Point Likert scale, ranging from \"not at all\" to \"very much\", for the following subscales and their specific items:  
1. Beliefs in Privacy Rights: (a) Users' right to be left alone, (b) users' right to use Internet anonymously, (c) no gathering of disclosed personal information without users' consent, and (d) users' right control on their personal information [38]. 2. Privacy Concerns: (a) I am concerned about my online information being linked to my publicly available offline one; (b) I am concerned that the information I submit on SMs could be misused; (c) I'm concerned that too much personal information is collected by so many SMs; (d) It usually concerns me when I am asked to provide personal information on SMs; (e) I am concerned that others can find private information about me online; and (f) I am concerned about providing personal information on SMs, because it could be used in a way I did not forese. [28; 39]. 3. Information Collection: (a) It usually bothers me when SMs ask me for personal information, (b) When SMs ask me for personal information, I sometimes think twice before providing it, and (c) It bothers me to give personal information to so many SMs [40; 41]. 4. Self-disclosure: (a) I frequently talk about myself online, (b) I often discuss my feelings about myself online, (c) I usually write about myself extensively online, (d) I often express my personal beliefs and opinions online, (e) I disclose my close relationships online, and (f) I often disclose my concerns and fears online [42]. 5. Trusting Beliefs: (a) SMs would be trustworthy in information handling, (b) SMs fulfill promises related to the information provided by me, (c) I trust that SMs would keep my best interests in mind when dealing with my provided information [41]. * Privacy Control: (a) I have control over who can get access to my personal information online, (b) I always optimize my privacy settings when I create an online profile, (c) I consider the privacy policy of SMs where I give out personal information, (d) I would opt out of a service due to privacy issues, and (e) I only upload information online that is suitable for everyone that can see [27; 28; 39; 42]. * Privacy Awareness: (a) Personal information is of value to SMs providers, (b) I am aware of the privacy issues and practices in SMs, (c) SMs providers do not have the right to sell users personal information, (d) I follow the developments about privacy issues and violations within cloud, (e) I keep myself updated on privacy solutions that law and SMs employ, and (f) I am aware of protecting my personal information from unauthorized access [28; 39]. * Collaborative privacy management: (a) Prior to disclosing content, my group members and I discuss the appropriate privacy settings, (b) I ask for approval before dis-closing content from those group members involved, and (c) My group ask for approval before uploading content concerning myself [43]. * Self-disclosure/ Cost-Benefit: (a) The risk posed to me if personal information is exposed outweighs the benefits of sharing it, (b) In general, my need to obtain SMs is greater than my concern about privacy, and (c) I value the personalized SMs I received from providing such personal information [39]. In general, most of previous works tend to focus on informational privacy concept, while their metrics usually spotlight specific privacy constructs, such as privacy concerns, risks, trust, data collection [28], neglecting users' socio-contextual attributes.