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Some affiliate programs may offer two or more tiers that will allow you to be paid a bonus for people referred by the people you refer. This means that if someone you refer to a survey site joins the site's affiliate program and begins referring people, you make extra money if one of their referrals signs up. The more tiers there are to the affiliate program the more levels they will send you a bonus for if people under you sign up. Even if you don't actively promote the affiliate program referral bonus, most people will probably find it on their own by checking out the site and they may choose to sign up for the affiliate program even without your suggestion.