How beautiful to make authorization through social networks?

Question

MySQL

Let's say I have the opportunity to enter the site through 3 social networks. VK, twitter, facebook. A person logs in through VK, then in the settings he has the opportunity to link the accounts of the other two to his current one and log in through them in the future. How to beautifully style tables in MySQL in such cases? Enough of one, or you have to do with a binding. Please tell me how you solved this problem.
Do not offer services like ulogin

Answer 1

This question has already been raised on the toaster.
The dependencies are:
Login => Device (ID) => Authorization: Social network => Authorization data (token)
Login => Device (ID) => Authorization: Password => Authorization data (password, etc.)
, etc. .d.
That is, the user login on your service is always at the very top of all dependencies.