and MySQL http://www.facebook.com/MySQLatFacebook
http://blog.facebook.com/blog.php?post=7899307130
More interesting are how they use technologies rather than only which one, f.ex this: http://www.allfacebook.com/2010/02/facebook-makes-their-web-...
http://blog.facebook.com/blog.php?post=7899307130
More interesting are how they use technologies rather than only which one, f.ex this: http://www.allfacebook.com/2010/02/facebook-makes-their-web-...