It is possible to create a quick login for your helpdesk via Facebook To do so, you need to follow these steps:

Register Facebook app

Visit [https://developers.facebook.com/apps/] and click on “Add a new App”

initial page

After that enter the app settings

Create App

Navigate to “Settings” and fill in this infromation

App Settings

Navigate to app review and Check “Make [appname] public?”

App Review

Configure Zammad as Facebook app

Navigate to “Admin -> Security -> Third Party Applications” and enter the App ID and the App Secret. You can find this Key in the Dashbard of your Facebok app.

Zammad Configuration

Now you can link accounts via “Avatar -> Profile -> Link Accounts” or login via Zammad login page.