The relationship between social media use and mental health remains under scrutiny by researchers, policy makers, and the general public. Recently, researchers have addressed whether or not Facebook use is beneficial to people with high social anxiety. The findings from such studies are mixed, in part due to differences in how variables are operationalised. A study by McCord et al (McCord, B., Rodebaugh, T. L., & Levinson, C. A., 2014. Facebook: Social uses and anxiety. Computers in Human Behavior, 34, 23-27) suggested that the inclusion of a new variable, Facebook-centric social anxiety, helps explain the complex relationship between general social anxiety and frequency of usage of socially-interactive Facebook features. We undertook two replication studies (N=202; N=542) of McCord et al (2014), using the original three measures (general social anxiety, frequency of usage of socially-interactive Facebook features, and Facebook-centric social anxiety). Both replication studies corroborated the correlational findings of the original study. We found a significant positive association between general social anxiety and Facebook-centric social anxiety. However, we did not find evidence that general social anxiety and Facebook-centric social anxiety interacted to predict frequency of usage of socially-interactive Facebook features. We discuss the implications for future research on social Facebook use.