Social media has become core to our daily interactions, enabled by people's willingness to share feelings, opinions, and even the most mundane details of their lives. These self-disclosure practices raise many questions about why people disclose in such a public manner, despite the potential risks. The present study examined self-disclosure on Facebook and considered two factors that may encourage people to share more information: trust and social capital. Self-disclosure, trust and social capital have not been previously studied in combination. Trust was considered in terms of an individual's trust in Facebook, and general trust, as a personality disposition. Two types of social capital, namely, bridging and bonding, were measured. Data collection involved an online survey completed by 263 Australian Facebook users. The results showed that general trust was not related to self-disclosure on Facebook. However, trust in Facebook, as well as bridging and bonding social capital all correlated with self-disclosure on Facebook. Regression analysis revealed that bridging social capital was the only independent variable that significantly predicted self-disclosure on Facebook. This is alarming because bridging social capital could be linked to more security risks, as people are focused on the benefits of broadening their online networks, rather than the potential risks of sharing personal information with a large number of people. Findings from this research offer important insights about why people may be inclined to share information on social media, and could be useful in the communication of social media risks.
