This document summarizes a book review of "Learning together online: Research on asynchronous learning networks" edited by S.R. Hiltz and R. Goldman. The review provides the following key points: 1) The book is a collection of essays from a 2002 workshop on teaching in Asynchronous Learning Networks (ALNs) that focuses on applications in adult education rather than primary/secondary schools. 2) The book aims to provide a state-of-the-art review of ALN research literature but dismisses practitioners' literature. 3) The first part deals with theoretical frameworks for ALNs while the second provides reviews of research topics like online student behavior and virtual learning communities. 4)