This chapter continues to study social media platforms but with a focus on the relationship between citizens and companies, particularly the co-production of data that serves as an important company instrument in the state–company partnership. It reveals inequalities in data production among citizens, systematically varying in terms of geographical distribution, privacy concerns, motivations, and choice. It differentiates different types of user behavior – discussing (producing political content and metadata) and lurking (producing metadata). Based on the China Internet Survey (CIS) 2018, it finds that Chinese users have similar motivations to users in other contexts, thus contributing to data production as privacy concerns remain less important compared to other motivations. This conceptualization of co-production rests not only on user participation on platforms, but also on the role of platform architecture and technological infrastructure that afford users’ choices. Through examining the role of the Great Chinese Firewall, the chapter finds that only about 12 percent of internet users jump the firewall to seek political information. A comparison of the three most popular platforms regarding their technological design show that Weibo and Baidu Tieba facilitate the production of political content more effectively compared to WeChat.