Register with Facebook sometimes doesn’t provide email

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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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