Privacy concerns have become public attention [1] along with the rising popularity of social networking sites [2]. According to Emarketer (2016) [3], Facebook is the most popular social networking site in the world, although there are many new social networking sites arise. This paper investigated Facebook privacy concerns among teens using Internet Users’ Information Privacy Concerns (IUIPC) and Technology Acceptance Model (TAM) which revised by Rauniar et al. (2014) [4] to meet the need of investigating user acceptance of social networking sites. The research model comprised of thirteen constructs which three of them are second-order constructs of IUIPC. The constructs are perceived ease of use (EU), critical mass (CM), capability (CP), perceived playfulness (PP), perceived usefulness (PU), intention to use (IU), actual use (AU), trust, risk, internet users’ information privacy concerns (IUIPC) and its second-order: collection (CL), control (CTRL), and awareness (AW). The data are collected from a questionnaire survey and analyzed using Structural Equation Modeling. This paper attempted to explore the effects of privacy concerns on teens’ intention to use Facebook and provide reference for future study of privacy concerns on social networking sites. The result shows that privacy concerns does not affect teens’ trust to Facebook which it is also does not have effect on teens’ intention to use Facebook. The only factor that has a positive effect on teens’ intention to use Facebook is perceived usefulness.

Social media is a media to support human interaction, one of which is Instagram. Approximately there are 400 million of activities on Instagram every month and an average of photos uploaded every day is more than 80 million, which indicate a desire of users to upload personal photos on Instagram. The objective of this study is to determine the factors that influence users to upload personal photos on Instagram based on a model. The model consists of 7 constructs, namely Perceived Security Control, Trust in Member, Trust in Provider, Habit, Benefit, Perceived Risk and Self-Disclosure. Data obtained from the survey of 217 active Instagram user range from 16 to 24 years old. Structural Equation Modeling (SEM) is used to analyze the factors. The results of this study indicate that factors influencing self disclosure through photos uploaded on Instagram are advantages to be gained from the use of Instagram, risk and perceived security control of Instagram account.