This article discusses how cooperative learning as a socioinstructional approach, relates to both socially-based emerging technologies (i.e. Web 2.0) and to critical thinking with respect to co-cognition. It begins with a discussion of the importance of connecting cooperative learning, Web 2.0, and critical thinking. This is followed by the need to understand not only the differences between cooperative and collaborative learning but also the learning spectrum they create as well as how students perform and learn in these social contexts. It also connects critical thinking and learning theory, distinguishes the levels of critical thinking, discusses how cooperative learning supports critical thinking and why Web 2.0 is a proper platform for teaching critical thinking. It concludes with suggestions and a planning rubric for addressing aspects of cooperative learning and aspects of critical thinking in instructional planning for Web 2.0.