Database: link facebook account to your site account

Many websites are integrated with Facebook. After registering with a Facebook account, the website asks to create a website account, for example: pinterest.

I am wondering how two accounts are connected to each other in a database (for example, which attribute can connect them?).


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For the app developer to decide how the app / site account is linked to the Facebook account, but this is mostly done with the Facebook User id

, which is the only unique identifier provided by Facebook after the user has connected to the app.



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