Nongovernmental organization (NGO) hyperlink networks are institutionalized connective public goods. They influence which actors and what aspects of social issues are made visible to the public in search engine results. To understand how contextual forces and institutional pressures influence who hyperlinks to whom online, this research examines a hyperlink network of 410 NGOs with various social missions operating across China. It suggests that institutional factors external to the network impact the structure of NGO hyperlink networks. In particular, institutional convener and legal registration status induce homophily hyperlinking effects among organizations, controlling for network interdependencies and other organizational attributes. Implications for hyperlink networks, institutional homophily, NGO collective action, and the development of civil society in China are drawn from the results.