AstroSPACES is the world's first open source social networking solution. Coded from scratch, it is highly efficient and very easy to use.

Lovd offers a free open source social network platform.

Built with Ruby on Rails, Lovd is a social networking solution that has everything you need to build your community.

Open-source, independent, downloadable, scalable, customizable, full-featured, free software for building social networks, dating sites and web-communities.
Loaded with video chat, recorder, video player, forums, groups, events, video messenger, mailbox, desktop app, video sharing, photo sharing, iPhone app and much more. Build your own business or advance your hobby with Dolphin!

Free web icons and images including many social media icons

Information on how to secure your WordPress install