SocialEngine is a PHP-based social network platform that lets you create a social network on your website

What Company Is Offering:
SocialEngine is a PHP-based social network platform that lets you create a social network on your website. Right out of the box, your social network will offer nearly all of the features found on today's wildly popular social networks. Instead of hosting your social network on their servers, they give you complete control over your project by allowing you to download the source code and install it on your own server.

How It Works:

SocialEngine is a "platform" that gives instantly you a simple, unbranded network. This lets you get right to deploying your unique theme, social structure, or concept using our source code as a foundation.

SocialEngine is the only self-hosted social network platform that can truly give you the opportunity for explosive, viral growth. Other social network apps create social networks that look and work the same. SocialEngine's simple design lets you highlight your unique theme. We've gone to great lengths to make customizations easier, with detailed comments placed throughout the completely unencrypted source code. SocialEngine also includes advanced social features not found in other apps, like subnetworks, multiple possible friendship structures, and very comprehensive privacy settings.

More at:http://www.socialengine.net/