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I'm using Register with Facebook as one of the ways to log in to my web app, and expressly ask for the "email" permission..
On login, some of the user data ($facebook->api('/me')) is stored into the users database, however, sometimes the email field just doesn't exist - is this a common problem?
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Now, email is no longer required. Facebook registration even in desktop requires only Email OR Phone.
If you notice you are not receiving a Facebook password reset code email in your mailbox, it means that the current email address you are expecting the mail to come through is not linked to your Facebook account.
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Click the arrow in the upper-right corner of your news feed and select "Account Settings." Your email address is listed under General Account Settings.
Just a guess...
The facebook documentation says:
note: this field will not be returned if no valid email address is available for the user
Source: https://developers.facebook.com/docs/reference/api/user/
So when an email address become invalid (users who haven't used facebook in years and have destroyed/changed their email address since for example), facebook may stop returning this field.
5% of invalid address may sounds big, but if I check my facebook friends, I think more than 5% of them never use their account, and I wouldn't be surprised if the address they used when they signed in is now invalid.
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