The document analyzes the use of the social media platform Twitter to teach English as a foreign language to Chinese students. It finds that Twitter provides opportunities for students to actively produce English in short messages, allowing them to practice communicative and cultural competence. A case study was conducted with 90 Chinese students who posted over 5,500 tweets in English over seven weeks. An analysis of the tweets found they helped students develop sociolinguistic skills like appropriate style and strategic skills for handling communication breakdowns. Students also engaged with native English speakers and different cultures on Twitter, exposing them to real-world language use and cultural awareness.