Top 40 Free Downloadable Open Source Social Networking Software

Wanna run your own Social Networking (FOSS) application?
Check out this nice list: http://www.vivalogo.com/vl-resources/open-source-social-networking-software.htm

Of course, if you are NOT set on FOSS, but rather FREE, here is another set:
http://ryanshamus.com/web-20-techniques/free-social-networking-sites/

And should you need an even longer list, check out Wikipedia:
http://en.wikipedia.org/wiki/List_of_social_networking_websites