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A site is a collection of openly accessible, woven Website that share a single domain name. Web sites can be developed and preserved by a specific, group, business or organization to serve a variety of purposes. Together, all publicly easily accessible sites constitute the Internet. Sites are available in a nearly unlimited variety, consisting of academic sites, news sites, discussion forums, social media sites, e-commerce websites, and more.
What is Pligg?

Pligg is an open source content management system that lets you easily create your own user-powered website.