This is an out-of-the box runnable Facebook app built on Rails 3. Just plugin your Facebook ID and keys and you're good to go.
It uses Devise, OmniAuth and the omniauth-facebook strategy.
To customize, replace MyAwesomeFacebookApp with your app name on these files: Rakefile config.ru app/views/layouts/application.html.erb config/application.rb config/environment.rb config/environments/development.rb config/environments/production.rb config/environments/test.rb config/initializers/secret_token.rb config/initializers/session_store config/routes.rb
Edit config/initializers/devise.rb. Change this line: config.omniauth :facebook, "APP_ID", "APP_SECRET"
and put in your actual Facebook app ID and app secret.
References: https://github.com/plataformatec/devise/wiki/OmniAuth:-Overview https://github.com/intridea/omniauth/wiki/List-of-Strategies https://github.com/mkdynamic/omniauth-facebook https://github.com/mkdynamic/omniauth-facebook/blob/master/example/config.ru http://railsapps.github.com/tutorial-rails-devise-rspec-cucumber.html