What software languange to build a site like ning,socialgo and grou.ps

hello guys i have one question for you.what software language that we use to build a site like ning socialgo and grou.ps,what software they use to build that software and platform so they can make platform for people to create their own social network with their software

I’m not sure what languages are used for these sites. Are you planning on creating a similar platform? There are many server side languages you can use. PHP is one I use often.