You can configure authentication services with external OAuth providers, right now Twitter, Facebook, Google and Wordpress are supported.
1. Create an App on the platform
For each platform, go to their developers section and follow their guides to create an app.
2. Set the authentication URL of your Consul Democracy installation
They'll ask you for the authentication URL of your Consul Democracy installation, and as you can see running rails routes |grep omniauth at your Consul Democracy repo locally: