AbstractMany psychiatric disorders are characterized by altered social cognition. The importance of social cognition has previously been recognized by the National Institute of Mental Health Research Domain Criteria project, in which it features as a core domain. Social task‐based functional magnetic resonance imaging (fMRI) currently offers the most direct insight into how the brain processes social information; however, resting‐state fMRI may be just as important in understanding the biology and network nature of social processing. Resting‐state fMRI allows researchers to investigate the functional relationships between brain regions in a neutral state: so‐called resting functional connectivity (RFC). There is evidence that RFC is predictive of how the brain processes information during social tasks. This is important because it shifts the focus from possibly context‐dependent aberrations to context‐independent aberrations in functional network architecture. Rather than being analysed in isolation, the study of resting‐state brain networks shows promise in linking results of task‐based fMRI results, structural connectivity, molecular imaging findings, and performance measures of social cognition—which may prove crucial in furthering our understanding of the social brain.