So, you want to start your own Digg or Reddit? Look no further. With PHP and MySQL, you can create your own Digg site in just five minutes. All you need is a PHP web server and MySQL database server; follow these instructions and you'll be up and running in time.

They use the Pligg software to do all of the hard work and describe its installation, configuration and use - simple and easy. You can find out more about Pligg on its website.