Another option for anyone who wants to create a social site without having to build it from scratch is the EngineY framework. EngineY is a social networking framework written in Ruby and Rails. It provides alot of popular social networking features such as activity streams, groups, photos, message boards, status updates, events, blogs, wall posts, integrated twitter feeds, and more. EngineY is also under active development with new features being added all the time. You can read more about EngineY and download it from: http://www.enginey.com
