we are looking for a way in Facebook to identify the user who have invited the most of his friends to our Fan page. Unfortunately this information is not provided by the admin statistics of Facebook itself.
We would like to announce a competition to all of the fans of our fan page in Facebook. Within one month the one who invited the most of his friends or more precisely the one fan who can bring the most number of further fans wins a price. To evaluate that we would need a statistic that could provide us this information. Maybe its just a trick, maybe its an application, maybe its a method. Anything is possible and the most simple and therefore cheap solution will get this project.
Please describe in your reply how you would achieve this.