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​ ** Introduction ** In the begging when internet was introduced only the government had control of web pages, but now more than 2 to 3 million people create their own web pages and around 1 million users create their own wiki pages.  ** Web 2.0 ** It seemed to appear in the media news when they wanted to describe a new experience that appeared on the internet - namely web sites that were based on what members were placing on the site. For example You Tube is based almost entirely of material uploaded by members. Flickr became a hugely popular site for storing and sharing your photographs. Another part of Web 2.0 is the rise in highly interactive features such as Google Maps. Once again, people can populate the maps with what they deem interesting. So perhaps a good definition of Web 2 is the point at which the Internet became truly interactive, with users becoming the most important component of many sites.

A wiki is a Web page that can be viewed and modified by anybody with a Web browser and access to the Internet. This means that any visitor to the wiki can change its content if they desire
 * Wikis **

Technically, a wiki is a mixture of a characters and a collection of plain text files that allows users to create Web pages “on the fly.” All it takes is a connection to the Internet and a Web browser

since wikis are easy to edit, they carry an natural potential to change how we construct knowledge repositories on the Web. Wikis allow groups to form around specific topics A blog—a shorthand term that means “Web log”—is an online, chronological collection of personal commentary and links. Easy to create and use from anywhere with an Internet connection, blogs are a form of Internet publishing that has become an established communications tool
 * Blog **

A blog can be thought of as an online journal, and maintaining a blog is as simple as using an online e-mail program. Bloggers enter posts into a blogging application, add formatting or hyperlinks, and save the post.

Blogs are proliferating at an exponential rate. Estimates suggest as many as 50 million people are now blogging Click here to view Mr. O’s blog

** Social networking websites ** Ning is an online service that allows users to create their own so­cial networks and join and participate in other networks. Ning lets creators of networks determine the site’s appearance and func­tionality, as well as whether the site is public or private. Most net­works include features such as photos or videos, lists of network members and events, groups within the network, and communi­cation tools such as forums or blogs No technical skill is required to set up a social network, and there are no limits to the number of networks a user can join. Registered users can create new social networks in very little time, with no technical skill required. Once a name and a URL are selected, assembling the network is a simple process of working through four screens

