Any good army isn't just staffed with believers of the cause. The easily-persuaded friends of those believers make up a crucial portion of every respectable army on the planet -- just ask Cobra Commander. That dude knows how to grease the wheels.
Microsoft understands this and has accordingly launched a "Refer-a-Friend" program of its own for Xbox Live, sans elaborate turkey dinner banquets. Referring friends (by Gamertag), can net existing Gold members tokens, which can be used to redeem one of four rewards, according to the promotion's "Official Rules":