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This document provides an overview of the history and evolution of the World Wide Web (WWW), from Web 1.0 to Web 2.0. It discusses key concepts like the read/write web, participatory web, and harnessing collective intelligence. It also summarizes many popular Web 2.0 tools and how libraries can use them, including blogs, wikis, RSS feeds, tagging, widgets, social bookmarking, networking, photo sharing, and more. The goal is to educate about practical uses of social software technologies in libraries.