This document discusses new types of social internet applications becoming popular in higher education, specifically blogs, social video sites, and virtual worlds. It explains that while originally developed for entertainment, these applications are now being adopted by higher education institutions. The document then provides definitions and explanations of key concepts like Web 2.0, how it differs from Web 1.0, and how applications like social networking sites allow for more participation and user-generated content compared to older websites. Specific technologies associated with Web 2.0 like AJAX and how they enable richer user experiences are also examined.