1) The document discusses the differences between Web 1.0 and Web 2.0, with Web 2.0 being more dynamic, interactive, and user-generated through tools like social media, tagging, and user comments.
2) It provides examples of how libraries can use various Web 2.0 technologies like social networking, tagging, feeds, wikis, podcasting, gaming, video sharing, and more to engage users and create and share content.
3) The document gives tips for safe use of online tools and profiles, including best practices for choosing usernames and passwords.