How to make an API if there is registration only using social networks?

Question

API

Users can ask questions on the site. How to organize the API, for example, to add new questions, if users can only enter the site using Facebook. What tokens to create, where to store them, etc.?
Thanks a lot for your help!

Answer 1

Very simple.
Give users tokens and secret keys for authorization.

Answer 2

Read the OAuth2 spec.

Answer 3

Hold on, IMHO an excellent tutorial on creating your own api-server, the issue of authorization with your own hands through tokens
is considered apionrails.icalialabs.com/book/_single-page