Yes, you are able to use the {{{email}}} tag in an email template for guests that have hidden their Facebook email. To see what a hidden Facebook email looks like, please see Will users that signed up with Facebook be able to receive emails?
There are two caveats to using the tag in an email template:
- If the guest hid their facebook email and either never manually added a secondary email or later authorized to share their Facebook email, then the guest will not receive marketing emails.
- If the guest does have a secondary email, either by adding manually or later authorizing to share their Facebook email, then the guest will receive marketing emails to their secondary email but the {{{email}}} tag will show their primary email which will look like 123456789101112@fb.punchh.com.