Social behaviors are essential for survival and social circuits must rapidly integrate, process, and communicate with brain-wide behavior networks. The medial amygdala is an important center for social integration that both processes social input and generates behavioral outputs. Aromatase-expressing neurons in the medial amygdala drive behavioral responses including aggression and social recognition. We recently identified the brain regions that provide synaptic input to aromatase-expressing neurons in the medial amygdala using rabies tracing and light sheet microscopy. These results confirm the central role of the medial amygdala in sex-specific social behavior and also highlight an unexpected level of integration of multiple sensory and homeostatic factors which may serve to modulate social behaviors. Broad integration is also clear in the moment-to-moment activity of aromatase neurons during social interactions. By understanding the detailed circuitry and physiology, as well sex differences and similarities in these properties, we are starting to understand medial amygdala-dependent social behaviors such as affiliation, parenting, social memory, predator avoidance, and aggression at a mechanistic level.