Empathy is seen as the capacity to perceive, understand and experience others' emotions. This notion is often considered as one of the major elements in social interactions between humans. As such, when creating social agents, that are believable and able to engage users in social interactions, empathy needs to be addressed. Indeed, for the past few years, many researchers have been looking at this problem, not only in trying to find ways to perceive the user's emotions, but also to adapt to them, and react in an empathic way. This paper provides a small overview of this new challenging area of research, by analyzing empathy in the social relations established between humans and social agents, and providing a concrete model for the creation of empathic social agents.