This chapter introduces social network analysis as a method to assemble and examine digital diasporas. Building on network and graph theories, applications of social network analysis enable the mapping and formal measuring of relationships and flows between people, groups, digital objects, and other connected information or knowledge entities. The chapter introduces a range of basic network statistics and theories that are useful to researchers of diaspora, followed by a case study of how these statistics and theories can be applied to the study of Vietnamese traditional medicine networks on Facebook. The chapter concludes with a discussion on the opportunities and challenges that social network analysis poses for the study of digital diaspora, highlighting the deliberative nature of this method in setting parameters around constructed networks, and outlining the theoretical implications that this method could have for diaspora studies.