Facebook Application

We need a facebook application, where members of our group can invite friends to our group, and where we have a “Hall of Fame?? application, where you show who of the group members, that have invited most friends to the group, where the invited friends have participated the group. You can see an example of such a “Hall of Fame?? application, that I am looking for, at <[login to view URL]>? - where we only need the application to show recruiters to the group.