2. Web 2.0 is the second generation of Internet-based services that emphasize online collaboration and sharing among users.

4. Social-networking sites Video-sharing sites Image-sharing sites Wikis Blogs Social-bookmarking sites A Web 2.0 site allows the user to interact with other users or to change the website content.

5. http://www.youtube.com/watch?v=6a_KF7TYKVc

7. A “wiki” is a website or similar online resource which allows users to add and edit content collectively. Wikis allow users to share knowledge and up-to- date information.

8. http://www.youtube.com/watch?v=-dnL00T

9. A blog (a contraction of the term "weblog”) is a type of website, usually maintained by an individual with regular entries of commentary, descriptions of events, or other material such as graphics or video. Entries are commonly displayed in reverse- chronological order. "Blog" can also be used as a verb, meaning to maintain or add content to a blog.

10. http://www.youtube.com/watch?v=NN2I1pWXjXI

11. Social bookmarking is a method for users to store, organize, search, and share bookmarks of web pages. This is done using tags. Tags replace the old-fashioned use of folders to organize bookmarks using the browser. Tagging allows for the kind of multiple, overlapping associations that the brain itself uses, rather than rigid categories.

12. http://www.youtube.com/watch?v=x66lV7GOcNU

13. Type http://delicious.com/ in your browser’s address box.http://delicious.com/