Parties and social movements play an important role in many theories of political science. Yet, the study of intraparty politics remains underdeveloped as random samples are difficult to conduct among political activists. This paper proposes a novel procedure to sample different parties over time and space by utilizing the advertising option of the social media webpage Facebook. As this method allows for quotas and the collection of large samples at relatively low cost, it becomes possible to improve the representativeness through poststratification and subsample robustness checks. Three examples illustrate these advantages of Facebook sampling: First, a Facebook sample approximated intraparty decisions and the outcome of a leadership contest of the Alternative for Germany. Second, a weighted Facebook sample achieved similar estimates as a representative local leader survey of the Social Democratic Party of Germany. Third, by evaluating subgroups of key demographics for parties with unknown population parameters, two Facebook samples show that the color-coded conflict in Thailand was driven by different concepts of regime type, but not by a left–right divide on economic policy-making. Facebook sampling appears to be the best and cheapest method to conduct time-series cross-sectional studies for political activists.

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Summary Empirical studies show that government ideology has hardly influenced welfare expenditures since the 1990s, casting doubt on the general ability of national governments to design economic policies according to their programmatic appeals. This study takes a comprehensive view on policy‐making by using a modified version of the Fraser Institute's Economic Freedom of the World Index. I focus on the aspects of economic freedom that provoke party polarization and that national governments are capable of influencing. The results suggest that government ideology still matters in the early 21st century: The empirical analysis of 36 OECD or new European Union member states from 2000 to 2012 shows that left‐wing governments are associated with significantly lower economic freedom. Economic freedom continues to be the guiding principle that divides left and right in economic policy‐making because the left still promotes relatively higher levels of government spending and regulation.

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