Pligg is an open source Content Management System (CMS) that you can use for free. Pligg CMS provides social networking software that encourages visitors to register on your website so that they can submit content and connect with other users. Use Pligg content management system to start your own social networking community in minutes.
Pligg was created as a social publishing CMS. While most content management systems are designed for only a handful of authors, Pligg CMS was designed to manage a site with an unlimited number of authors. All of these registered users are in control of the website's content. It is a user driven CMS that relies on independent authors content and participation to manage news articles.