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Web 2.0 describes World Wide Web sites that emphasize user-generated content, usability, and interoperability. The term was popularized by Tim O'Reilly and Dale Dougherty at the O'Reilly Media Web 2.0 Conference in late 2004, though it was first coined by Darcy DiNucci in 1999.[1][2][3][4] Although Web 2.0 suggests a new version of the World Wide Web, it does not refer to an update to any technical specification, but rather to cumulative changes in the way Web pages are made and used. A Web 2.0 site may allow users to interact and collaborate with each other in a social media dialogue as creators of user-generated content in a virtual community, in contrast to Web sites where people are limited to the passive viewing of content. Examples of Web 2.0 include social networking sites, blogs, wikis, folksonomies, video sharing sites, hosted services, Web applications, and mashups.[5] Whether Web 2.0 is substantively different from prior Web technologies has been challenged by World Wide Web inventor Sir Tim Berners-Lee, who describes the term as jargon.[6] His original vision of the Web was "a collaborative medium, a place where we [could] all meet and read and write".[7][8] On the other hand, the term Semantic Web (sometimes referred to as Web 3.0)[citation needed] was coined by Tim Berners-Lee for a web of data that can be processed by machines.[9]

Web 2.0 is the current state of online technology as it compares to the early days of the Web, characterized by greater user interactivity and collaboration, more pervasive network connectivity and enhanced communication channels. 

Exploring the Tools (General) 23 Learning 2.0 Things The original Learning 2.0 Program, created for the Public Library of Charlotte & Mecklenburg County (North Carolina). This site was created to support PLCMC's Learning 2.0 Program; a discovery learning program designed to encourage staff to explore new technologies and reward them for doing 23 Things. The site includes information on replicating the learning program for your library. 100 Free Library 2.0 Webinars and Tutorials Resources for Librarians about Online Social Networking from ALA's Young Adult Library Services Association (YALSA, a division of ALA) Online Social Networking Tools: An introduction(PDF) Presentation at the New Mexico Library Association Meeting in Farmington, New Mexico, April 21, 2006. Library Technology Reports Provides library professionals with insightful elucidation, covering in-depth the technology and technological issues the library field grapples with on a daily basis in the information age. Some abstracts available online. Webtools4U2Use, "a place for K-12 school library media specialists to learn a little more about web tools that can be used to improve and enhance school library media programs and services, to see examples of how they can be used, and to share success stories and creative ideas about how to use and integrate them," created for school library media specialists by Dr. Donna Baumbach and Dr. Judy Lee, University of Central Florida. Web 2.0 & Libraries page at the YALSA Wiki

This report presents findings from a two-year investigation of the ways in which Web 2.0 tools and social networking technologies are being used to support teaching and learning in classrooms across the United States. With funding from Intel®, the Education Development Center's Center for Children and Technology (EDC/CCT) interviewed or visited over 30 educators in 22 different schools throughout the country as they employed these tools in their classrooms in innovative ways. We also spoke with and observed a number of students in these schools. Currently, there is much discussion and excitement about Web 2.0 in education, but we still know very little about how these tools actually work in the classroom. Therefore, the goal of this research was simply to interview and observe educators and students who are experimenting with these tools in the classroom to see what uses are emerging and to explore the learning affordances of blogs, wikis, and other Web 2.0 tools.