Apparently, it's just for Facebook only. https://www.google.com/mail/help/contacts_export_confirm.html https://www.google.com/mail/help/contacts_export_confirm

Apparently, it's just for Facebook only. https://www.google.com/mail/help/contacts_export_confirm.html https://www.google.com/mail/help/contacts_export_confirm.htm... By the link of this, one can see that only exporting to Facebook would render this confirmation message.