You've covered a lot of ground in this tutorial series, building a complete Facebook application from scratch in both Java and PHP, the Java half running in IBM WebSphere Application Server and developed using IBM Rational Application Developer, the PHP half running under Zend Core For IBM; the two halves sharing an IBM DB2 database. You've explored Facebook's integration points and how to access them from both PHP and Java using the client libraries, FBML and FBJS. You can now develop your own Facebook applications using all these technologies. Be sure to keep up with the Facebook developer blog and Wiki because Facebook changes the API and supported functionality on a fairly frequent basis. Enjoy your new skills and go write a hit application.