1. The document discusses the history and antecedents of Web 2.0, including marginal annotations, encyclopedias, and other responses to information overload preceding the modern internet. 2. It describes key aspects of Web 2.0 like user-generated microcontent, open APIs, mashups, wikis, blogs, social media platforms, tagging or "folksonomies", and visual storytelling through photos and videos. 3. Statistics are presented on the large scale of Web 2.0 in 2008, with over 70 million blogs tracked by Technorati and millions of users on sites like Flickr, YouTube, and Wikipedia.