信息隐私保护包括主动和被动两个方面，它们对于信息安全都至关重要。本研究 重点从个人主动层面关注社交网络用户对信息隐私的态度和行为，通过线上问卷调查的方式获取微信和微博用户样本355例，探索隐私关注、自我表露意愿、自我感知的防护表现以及社交推文发送之间的关系，并据此进一步理解隐私悖论现象。研究发现，在社交网络中发送更多信息的用户通常具有更高的隐私关注、更高的自我表露意愿以及更少的网络使用经验；此外，自我感知的防护表现也会通过隐私关注和自我表露意 愿的中介作用从而间接地影响社交推文发送行为。上述发现表明了隐私悖论在社交网 络中的存在，当用户认为他们拥有更好的防护表现时，他们往往会认为自己更加关注 信息隐私并且不再抑制社交网络中的推文发送；同样地，自我感知的防护表现也会正 向影响自我表露意愿，后者则是用户在社交网络中发送推文的主要驱动因素。

Self-protection and protected by internet service provider are both accounting for information privacy security. This study focused on the attitudes and behaviors of social networking service(SNS) users toward individual information privacy, by using online questionnaire method to access 355 China’s SNS users, to investigate the relationship between privacy concerns, general willingness to self-disclosure, protective performance by selfassessment, and tweets sending behaviors in the social network. Findings indicate that users who send more tweets in their social networks often have higher willingness of self-disclosure, higher privacy concerns, and less network experience. Additionally, mediated by privacy concerns and general willingness to self-disclosure, SNS users’ protective performance based on self-assessment can positively affect their numbers of tweets sending. Our results show the existence of privacy paradox in social networking service. More specifcally, when SNS users think they have better performance in information privacy protection, they tend to think that they are more concerned about information privacy and will no longer suppress the tweet transmission in social networks. Furthermore, SNS users’ protective performance by selfassessment will also positively affect their general willingness to self-disclosure which is a strong determinant of their tweets sending behaviors.