Devise_facebook is a project mainly written in ..., it's free.
Devise Facebook Omniauth Rails 3
Hi,
This application in configured with devise, facebook, omniauth. You just need to do following things.
bundle install
do configuration in database.yml file according to your requirements.
Configure facebook app in your facebook account.
add facebook_app_id, facebook_secret_key in config/initializers/omniauth.rb file
then start your server.