ENV VARS:

To set Unicorn on Heroku add this config var:

heroku config:set WEB_CONCURRENCY=6

---

Facebook app credentials:

FOR PRODUCTION ON HEROKU:

heroku config:set FB_APP_ID=the_facebook_app_id
heroku config:set FB_APP_SECRET=the_facebook_app_secret

FOR YOUR LOCAL DEVELOPMENT:

Add this file (not tracked for security) "/config/initializers/dev_environment.rb" with this content:

unless Rails.env.production?
  ENV["FB_APP_ID"]="the_facebook_app_id"
  ENV["FB_APP_SECRET"]="the_facebook_app_id"
end