This article provides an overview of using the social bookmarking site Diigo to facilitate collaboration in the classroom. It describes Diigo's features like highlighting text, adding notes, categorizing and sharing bookmarks. These features allow students to research, organize, and share resources. The article also notes how teachers can use Diigo to highlight information, write comments, organize pages, and support collaboration. Overall, the article suggests Diigo is a useful tool for students and teachers to facilitate online discussion and sharing of resources.