(also multi-level, two-tier or tiered program): a model where affiliates are allowed to refer new affiliates to Share Results and earn a commission on the new affiliates' performance; example: WebsiteABC refers Website123 to Share Results. Website123 signs up with 3 merchants and earns $X in commission. WebsiteABC earns commission, which varies depending on the merchant program, on the commission earned by Website123.
A money-making program where you earn money based on recruiting others into the program (referring). Many companies usually pay for the refferals their users or members recruit a percent of the referrals' earnings or deposits.
(also multi-level, two-tier or tiered program): a model where affiliates are allowed to refer new affiliates and customers to a website and earn a commission on their customers' purchases and new affiliates' performance.
A referral program is another name for an affiliate program, a business arrangement in which a vendor pays someone a commission for referring customers to the vendor's site. You are usually paid a specified amount per sale. It's a bit like being a commissioned sales person - online.