As Destinova stated, the Recruit A Friend page states:

* These rewards will be sent out in order after July 2015.
* An email is sent when you successfully recruit a friend. To confirm the number of friends you have recruited, please confirm the number of emails you have received. We plan to add a feature to the Mog Station in the future to allow you to view the number of successful recruitments.
You can view the Recruit A Friend campaign page here for more info. It can also be accessed by clicking the Recruit a Friend banner on the Lodestone sidebar.