Friend Recruitment Code?

[HappilyMarried]

I looked through the pages and pages of helpful info on this thread, and couldn't find the answer to a few things (sorry if these have indeed been answered already).

If I recruit (I'm on Famfrit), can the qualifying recruitee use the code for a different world if they don't want to be on Famfrit? If they can use the code for a different world, are they limited to just the worlds on Primal?

If I successfully manage to find a recruitee, but they only stay long enough for the circlet, can I recruit someone else for the later rewards, like the mount? I understand that I won't get multiples of an item. If I can recruit more people and earn those later rewards, will recruitee #2 be able to get their circlet, even though I will have already earned mine?

Last question, I swear. If I recruit someone, can they later recruit someone and earn their own mount? I would feel pretty crappy if I shafted someone out of a mount for my own personal gain.

Thanks for the help!