The account that recruits the friend and the account that was recruited get the bonus, the bonus does not stack (ie you can only get a maximum of (x3) Xp, no extra for being rested. The bonus does not apply to the entire group only accounts that have recruited and have been recruited.

So If I Own account A and B atm, I Recruit account C using Account A and Account D using Account B then I can effectively get (x3) Xp on all 4 accounts assuming they are all partied together.

That is how it works. 8|