Taken from the fubar bible:
The referral link was previously disabled for fraud reasons, but has been enabled once again! For clarity, this means that both the invite link and the email invite process will both get you points! However, there is a catch: You will not get ALL the points right away. Why? Because we're smarter than that, and we know you gamers like to try and game us. So, we've come up with a solution:
From the Bible: (http://fubar.com/bible.php#invite_bonus)
How does the Invite Bonus work?
fubar rewards you by giving bonuses for when your friends join and use fubar - Up to 14,000 fuBucks and points per friend! Here's how it works:
• You will get 1,000 fuBucks and points when your friend joins
• You will get 1,000 fuBucks and points every day your invite uses fubar (up to 5 days; non-consecutive)
• You will get 8,000 fuBucks and points when he or she posts an approved salute!
Remember, we're all about fair play, so if you cheat we WILL find you.
Party on. 
