The present study examines the usage of social media (i.e., Facebook and Twitter) by Members of the European Parliament (MEPs) of the current legislative term. Specifically, it tests the impact of several predictors on MEPs' social media adoption and popularity as measured by the number of social media supporters. Differences in social media usage of MEPs were found to be explained by variables such as parliamentarians' gender, Europarty affiliation, and country-of-origin. Moreover, results suggest that social media popularity of MEPs could be predicted by the European region form which political actors originate, the ideology of their Euro-party affiliation, and the type of committee in which MEPs are assigned. In addition, the study sheds light on how the two platforms (Facebook and Twitter) differ in regards to the factors that impact MEPs' social media popularity.