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This paper extends theories of public goods to interactive communication systems. Two key public communication goods are identified. Connectivity provides point‐to‐point communication, and communality links members through commonly held information, such as that often found in databases. These extensions are important, we argue, because communication public goods operate differently from traditional material public goods. These differences have important implications for costs, benefits, and the realization of a critical mass of users that is necessary for realization of the good. We also explore multifunctional goods that combine various features and hybrid goods that link private goods to public ones. We examine the applicability of two key assumptions of public goods theory to interactive communication systems. First, jointness of supply specifies that consumption of a public good does not diminish its …