How are states using cultural diplomacy on social media to expand their power? This research analyses over 67,000 tweets from the French and Chinese Ministries of Foreign Affairs ( mfa s) as well as their respective state-sponsored cultural networks including Institut Français, Alliance Française , and the Confucius Institutes. Stephen Lukes’ three-dimensional power framework, where cultural authority legitimizes power over others, provides the study’s theoretical basis. In analysing the tweets, I employ a mixed methods approach including vader sentiment analysis, word frequency analysis, and thematic analysis. While both states aim to present their cultures as high-value cultures, the similarities end there. As a liberal democracy, France encourages open expression through its cultural institutions, including discourse critical of France. In contrast, China’s cultural diplomatic messaging is precisely controlled and speaks about China in invariably exalting terms. This study offers evidence that regime type has a powerful effect on cultural diplomatic messaging on social media.