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This chapter introduces the rationale behind a social network analytic (SNA) approach in the context of second language acquisition (SLA). The conceptual overview presents ways of operationalising social graphs and common metrics used in the calculations, supported by illustrative examples. We then argue for merging quantitative SNA with qualitative data. Subsequently, we showcase findings from the PEERLANG project (Paradowski et al., 2021) investigating the influence of peer out-of-class interactions on SLA in two different contexts: among international participants in intensive summer language courses (multilingual “immersion” scenario), and stationary foreign language majors (“no immersion”). We reveal patterns emerging from both contexts, demonstrating the role that mobility plays in network dynamics, and how both factors together moderate language attainment. We show that the impact of peer learner networks on L2 acquisition can be both positive and negative, depending on the context and the network layer involved. Computational and anthropological SNA offers a novel methodology for investigating the link between social relations and language acquisition (especially L2 production).