Social Networking PHP Open Source
PHPFox is a social networking solution that provides facility to create communities like Facebook and MySpace. For More Detail
Elgg is a powerful open source social networking engine that provides you core components for social networking applications.It is a main open source social networking engine which is used to create your own social networking websites.
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Drupal is a free software package that allows anyone to easily publish, manage and organize a wide variety of content on a website. Hundreds of thousands of people and organizations are using Drupal to power an endless variety of sites.
CakePHP is a rapid development framework for PHP that provides an extensible structured framework that enables PHP users at all levels for developing, maintaining, and deploying applications,without any loss of flexibility.It means you can code faster, your code is better.