This volume written by Dron and Anderson consists of ten chapters and is completed by a reference section and a useful index. The preface details the book’s objectives, after briefly explaining the ambiguous nature of its title (the book is about how to teach crowds, but also about how crowds teach): to describe and discuss the theoretical foundations of the use of social software for learning and to explore ways that such software is used to support and enable learners to learn. In brief, the book is mainly about the use of social software for teaching and learning.