My application uses its internal registration system to log in and log in ...
Now I'm looking at the idea of integrating Facebook Connect into my application, but I came to a situation in which, I think, I need some help ...
So users in my application for registration must choose a user name and e-mail address , which is unique .
What happens if a user tries to connect via Facebook and this user already exists? their email for example? or what happens if this user does not have a username? can i show them error messages depending on their situation?
Also, if the user does not have a username on facebook, but has an email address that is not registered on my system, I must show them a new input field so that they can enter their username before they can access the web the site?
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