The development and diffusion of social robots gives increasingly rise to ethical and legal concerns related to, e.g., responsibility assignments in cooperative tasks, implementation of moral rules in robots, possible dual uses and misuses of artificial agents, unintended modifications of social, cognitive, emotive and communication abilities in humans interacting with robots. The urgency of developing effective ethical inquiries related to these issues leads specialists to acknowledge the need to overcome classical approaches, based exclusively on philosophical analysis. Emerging trends are incorporating, within the frameworks of ethical inquiries on social robots, a series of methods, tools and scenarios defining empirical research in Social Robotics and HRI.