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Sampling 515 college students, this study investigates how privacy protection, including profile visibility, selfdisclosure, and friending, are influenced by privacy concerns and efficacy regarding one's own ability to manage privacy settings, a factor that researchers have yet to give a great deal of attention to in the context of social networking sites (SNSs). The results of this study indicate an inconsistency in adopting strategies to protect privacy, a disconnect from limiting profile visibility and friending to self-disclosure. More specifically, privacy concerns lead SNS users to limit their profile visibility and discourage them from expanding their network. However, they do not constrain self-disclosure. Similarly, while self-efficacy in privacy management encourages SNS users to limit their profile visibility, it facilitates self-disclosure. This suggests that if users are limiting their profile visibility and constraining their friending behaviors, it does not necessarily mean they will reduce self-disclosure on SNSs because these behaviors are predicted by different factors. In addition, the study finds an interaction effect between privacy concerns and self-efficacy in privacy management on friending. It points to the potential problem of increased risk-taking behaviors resulting from high self-efficacy in privacy management and low privacy concerns.

Problematic Internet use has long been a matter of concern; however, few studies extend this line of research from general Internet use to the use of social network sites (SNSs), or explicate the problematic use of SNSs by understanding what factors may enhance or reduce users' compulsive behaviors and excessive form of use on SNSs. Building on literature that found a positive relationship between gratifications sought from the Internet and problematic Internet use, this study first explores the types of gratifications sought from SNSs and examines their relationship with problematic SNS use. It found that three types of gratifications-diversion, self-presentation, and relationship building-were positively related to problematic SNS use. In addition, with a growing body of research on SNS privacy, a moderating role of privacy concerns on SNSs has been proposed to understand how it can influence the relationship between gratifications sought from SNSs and problematic SNS use. The findings suggest that different subdimensions of privacy concerns interact with gratifications sought in different manners. In other words, privacy concerns, including unauthorized secondary use and improper access, play a more influential role in constraining the positive relationship between gratifications sought and problematic SNS use when individuals seek to build relationships on SNSs. However, if individuals seek to have diversion on SNSs, their privacy concerns will be overridden by their gratifications sought, which in turn leads to problematic SNS use. Implications of these findings for future research are discussed.

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This study examines how consumers' corporate social responsibility (CSR)‐related activities in social media affect their responses to brands. We defined consumers' CSR‐related activities in social media as the extent to which consumers use social media to engage in CSR communication by companies. An online survey was conducted to examine social media users in China, the largest consumer market in today's global economies. This study developed a theoretical model and empirically tested the relationships between consumers' CSR‐related activities in social media, identification with the brand, and three consumer behavior outcomes: electronic word‐of‐mouth (eWOM) intention, brand attitude, and purchase intention. The results suggested that consumers' CSR‐related activities in social media significantly impacted eWOM intention and purchase intention through enhancing identification with the brand and positive brand attitude. This study provides important insights on consumer behavior and CSR by investigating social media, an important and emerging marketing platform. Moreover, this study fills in the research gap about the association between consumers' CSR‐related activities in social media and their responses to brands. Theoretical and managerial implications for CSR strategies in social media are discussed.

The Asia-Pacific constitutes the fastest growing region in mobile and social media penetration. Yet, the political implications of the technologies are not fully understood. Using probability samples of university students in Taiwan, Hong Kong, and China, this study examines the roles of mobile and social media news in offline and online political participation. Consistent with the O-S-R-O-R model (OrientationsStimulus-Reasoning-Orientations-Response), which derives from communication and cognitive mediation models explaining the relationship between media use and political participation, all three samples demonstrated indirect relationships between mobile/social media use and political participation through interpersonal political discussion and political efficacy. The study contributes to theory building by demonstrating the external validity of the O-S-R-O-R model across different political systems.

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