UC Berkeley researchers just published a review of human oxytocin studies in the Harvard Review of Psychiatry. Behavioral Health Central has a brief report. In a nutshell:
The researchers concluded: "Key conclusions are (1) human research with intranasal oxytocin has uniquely enhanced our understanding of the microstructure and function of the human social brain, and (2) the oxytocin system is a promising target for therapeutic interventions in a variety of conditions, especially those characterized by anxiety and aberrations in social function."
The paper is called The peptide that binds: a systematic review of oxytocin and its prosocial effects in humans.