I had the same (incorrect) assumption. Emails would definitely be more useful.
That said, via the Facebook API a user can give your app permission to access their own email, but they (thankfully) cannot give your app permission to access the emails of their friends. I'd guess that's why he wasn't able to include emails in the CSV.
That said, via the Facebook API a user can give your app permission to access their own email, but they (thankfully) cannot give your app permission to access the emails of their friends. I'd guess that's why he wasn't able to include emails in the CSV.