Anyone see a list of what framework is being used for each language? I created a Ruby app, and it's using Sinatra.

Edit: here's links to all the app templates, for anyone interested:

Python: https://github.com/heroku/facebook-template-python

Ruby: https://github.com/heroku/facebook-template-ruby

Node.js: https://github.com/heroku/facebook-template-nodejs

PHP: https://github.com/heroku/facebook-template-php