Ryan, T.; Xenos, S. (2011). "Who uses Facebook? An investigation into the relationship between the Big Five, shyness, narcissism, loneliness, and Facebook usage". Computers in Human Behavior. 27 (5): 1658–1664. doi:10.1016/j.chb.2011.02.004.

"Who uses Facebook? An investigation into the relationship between the Big Five, shyness, narcissism, loneliness, and Facebook usage" by Ryan and Xenos explores the relationship between personality traits and Facebook usage. The study examines how factors such as the Big Five personality traits, shyness, narcissism, and loneliness are related to individuals' engagement with the platform. The research sheds light on the psychological aspects underlying Facebook use and the influence of individual differences on social media behavior. Keywords: Facebook, personality traits, social media usage.