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A site is a collection of publicly obtainable, interlinked Website that share a single domain name. Sites can be created and also maintained by a specific, group, service or company to serve a variety of functions. Together, all publicly available websites constitute the Internet. Websites come in an almost limitless range, including academic sites, news websites, online forums, social media websites, e-commerce websites, and so forth.
What is Pligg?

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