## 3 Results
### Privacy Management  
Privacy, as a social phenomenon, is interpreted in several ways both individually and collectively [52] Since privacy definitions are shaped in SNs accordingly with users' societal landscape and outlet, it is important to comprehend how users understand and perceive privacy within them and which attitudes they enhance, in order to protect it. The following findings indicate these perceptions and attitudes. Under the light of GDPR, users' privacy rights are getting to the forefront of the discourse regarding privacy protection. From users' perspective, previous research has shown that the importance of privacy rights varies along with users' personal and social characteristics and along with the usage context [53]. In our case, findings indicate that participants rate really highly the significance of privacy rights when utilizing SNs, especially as far as the right to have control on their personal information (M = 4.73) concerns. The least high-valued--but still high rated-users' right, concerns their ability to use internet anonymously (M = 3.9). The responses for all items concerning participants' Beliefs in Privacy Rights are fully presented in the following Figure 1.  
Previous research has shown that privacy concerns are considered to be a highly important issue among SNs users [54; 55]. The findings of our survey support this previous evidence. The participants rated highly enough their privacy concerns, especially regarding the amount of personal information that is collected (M = 4.14) through social networks and the ways that it can be misused (M = 4.14). This finding indicates some of the reasons about their low investment on social capital, while previous literature has highlighted that privacy concerns have a negative impact on users' willing to throw themselves into social networks [56]. The responses for all items concerning participants' Privacy Concerns are fully presented in the following Figure 2.  
Compatibly with their responses for privacy concerns, participants declare to be a lot of bothered, when they provide personal information to many social networks (M = 4.32), while they also rate highly enough their doubts to provide them, when they are asked by the networks (M = 4.13). Ref. [57] support that the unwanted access to personal information or the over-collection of personal information constitute important faces of the online privacy issues that should be addressed in a more user-centric way. Previous research indicates a privacy paradox behaviour of users when utilizing SNs, since besides their concerns, they tend to disclosure personal information on their own [58], while it supports that much more attention should be paid towards the privacy risks they undertake their own due to this sharing information [59]. On the contrast, our findings show that participants' self-disclosure behaviors are consistent with their privacy concerns and their perceptions for information collection within SNs, declaring that they disclose information in a low level, with reference to their concerns and fears (M = 1.72), writing  
Figure 1: Beliefs in Privacy rights. Figure 2: Privacy Concerns. about themselves (1.95) and talking about themselves (M = 1.81), as well as their feelings (M = 1.53). These are illustrated in the following Figure 3.  
The importance of users' trust on the online environments is widely examined by previous literature [60]. Especially as far as social networks concern, trust is related not only with their engagement, but also with several privacy issues. Privacy concerns, in particular, are highly influenced by users' trust [61]. The participants in our survey, still consistent with their previous responses, rate very low their trust about how their social networks are handling their provided information, with special emphasis on the supporting of their best interests (M = 1.93).