PliggPligg is an open source social publishing application. Initially released in 2005, Pligg enables website visitors to submit and vote on news articles, similar to Reddit and Digg.
Pligg provides social publishing software that encourages visitors to register on your website so that they can submit content and connect with other users. Pligg creates websites where stories are created and voted on by members, not website editors. Use Pligg content management system to start your own social publishing community in minutes.