Describing intelligent agents with the help of cognitive and social notions is now well established in the domain of artificial intelligence. In the recent years, concepts such as trust, reputation, delegation, commitment and convention have been proposed in order to describe how artificial agents interact in an artificial society or in a virtual organization. This workshop aims at discussing formal theories and logics of information dynamics—including formal theories and logics of belief and preference change, learning theory, social choice theory and judgment aggregation— in order to better understand: - how information circulates in an artificial society by direct interaction, communication, signaling, etc.; how it affects trust; - how it contributes to the construction of reputation and collective attitudes (e.g., mutual beliefs, social agreements), and to the emergence of conventions. The workshop is an associated event of IJCAI-13 and will take place on August 3-5 2013, Beijing, China.