Whenever I create an account using Gmail and Facebook, both of them fill the email slot into the database. Though, when I create an account using LinkedIn, the plugin fails to populate the email for the new account but still creates a new row in the users data. This should all be automatically set up using the plugins but I just get this:
If you want to use the API connector (for free ) look on the service page of this plugin - there is information on the wider setup, and tips on what you will need to do in the API connector to get it working.