Referral marketing is a promotion method where current customers refer new customers for a reward. There are offline and online referral options. Online uses social media, websites, and emails. An effective referral promotion has an attention-grabbing title, prize graphic, entry info, submission form, and sharing buttons. Promotions are boosted through email, social media, websites, and ads. Metrics like entries and referrals are monitored on Facebook and Google. Post-promotion, the page is further promoted.