The document introduces various Web 2.0 tools for collaboration, sharing information, and multimedia creation and consumption. It discusses platforms for photo sharing (Flickr), social bookmarking (del.icio.us), video hosting (YouTube, TeacherTube), collaborative documents (Google Docs, Zoho), note taking (Google Notebook), live streaming (Ustream), wikis (Wikipedia, Wikispaces), photo editing (Picasa, PicNik), blogs (Blogger), podcasts, and virtual worlds (Second Life, Webkinz). Many of the tools allow users to decide whether to share content publicly or privately.