Building a real-time news feed with SharePoint Framework and webhooks
This solution offers the possibility to display toast notifications on the modern view, which is definitely really useful to keep informed the end user with communications and news. The solution architecture behind is exactly the same that I used to have a real-time news feed:

In order to build up this solution, please follow the steps in the previous article.
Check my video demo:
My solution is available on github:
Server: https://github.com/giuleon/SharePoint-Webhooks-Broadcaster
Client: https://github.com/giuleon/spfx-extension-react-webhooks-notification or https://github.com/SharePoint/sp-dev-fx-extensions/tree/master/samples/react-application-webhooks-notification