XAF security team has prepared a small demo illustrating the use of OWIN OAuth 2.0 Authorization Server. Users can log in with their Google, Facebook or Microsoft accounts.
You can download the demo source code from DevExpress Support Center:
https://www.devexpress.com/Support/Center/Example/Details/T535280/
Technical details and instructions on how to use this approach in your existing applications are available in the example description in Support Center.
Your feedback is welcome!
We would greatly appreciate it if you try this example and share your feedback here in comments.