Social Networking Open Source Platform

What web framework or tools used to develop websites Facebook, Bix? PHP, Wordpress, Spring (J2EE), other?

I the intend to go for one based on J2EE JBoss Seam, or WW2 + Spring + Hibernate to develop a site like Facebook, LinkedIn, Social networking capabilities. Also be integrated 3rd Party Blog, Forum Systems. Which option makes sense? Drupal or PHP-based Seam, JForum? I wonder what tools are used on Facebook, YouTube, etc. Bix website development. Its intuitive and friendly web interface. All use simple url as http://bix.yahoo.com/person/onemodelplac http://youtube.com/watch?v=awynvuspqbu&f … … But I can not say if they use Perl, PHP, ASP or Java. I want to know whether the use of open frameworks such as web-based PHP source Drupal, Wordpress platform based on J2EE Spring, Struts, or the home grow frame. Thank you, "Mike

Depending on the size of your project. J2EE may be too large an investment … Many sites use Drupal! It really depends on where your specialty is … Do you know Java or PHP or Perl or Python or Ruby? Friendly URLs can be accomplished in an underlying architecture using Apache! Mod_rewrite causes easy to hide nasty details of the actual directory structure. One of the characteristics of a web user friendly is friendly URLs! Another technology is not obvious they used!

Introduction to Social Network Analysis