SocialEngine is a PHP-based white-label social networking service platform that installs a customized full-featured social network on a user's website.

Main features include administration of small-to-mid scale social networks, complete customization capabilities, unencrypted code, multilingual capability, and modular plug-in/widget compatibility. There are a wide range of templates and add-ons available to extend the basic features already included in the SocialEngine core.

SocialEngine version 4.0 has been released, and has been built on an entirely different architecture than previous versions, Zend Framework (an open source, object-oriented web application framework implemented in PHP 5 and licensed under the New BSD License - a family of permissive free software licenses). This was intended to provide scalability and new feature sets. SocialEngine most recently announced that the newest features to be added will be built in membership billing as well a simple package manager.

SocialEngine installations are unbranded by default. Webligo Developments does not supply templates to alter the appearance of an installation, but these templates are available through third-party vendors.

Webligo Developments offers a variety of plug-ins to extend the functionality of SocialEngine into blog hosting, photo album hosting, groups, music sharing and hosting, video sharing and hosting, chat and instant messaging services, event planning, online polls, and forums.

Third-party companies such as SEplugins, SocialEngineMods, Hire-Experts, Radcodes, OpenCrypt, iExperts, SocialEngineZzz, and many others offer modular add-ons to create new functionalities. These functionalities may include:

  • OpenID authentication
  • Facebook integration
  • Twitter integration
  • Skype integration
  • Membership/subscriptions
  • File sharing
  • Language packs for multilingual support
  • Games
  • Searches
  • Icons

Source: Wikipedia