This paper explores the use of blogs, a simple application of Web 2.0 technologies, in middle school geometry instruction. Specifically, it provides an overview of the interactive features of Web 2.0 technologies and the feasibility of using Web 2.0 technologies in geometry teaching and learning, as well as a proposed model for creating a collaborative environment using a blog, a free and simple Web 2.0 application in geometry instruction. Incorporation of Web 2.0 technologies into today's classrooms builds on student interests and knowledge. Further, the interactive nature of these technologies lends itself well to collaborative learning, which motivates students, creates a "safer" learning environment, and enhances knowledge and skills.