pH7CMS is a 100% Open Source Enterprise-Class Social Dating Web App Builder & Leader #1 as “Dating Websites Provider”. Installation guide is here on GitHub page. But I think that a bit lack of information. Here is a memo when I setup it.
Oxwall is the most popular SNS framework that using PHP was developed as a project of Skalfa LLC. This is a supplementary explanation of the “Plugin Development Crash Course”. Check it out.