The document discusses best practices for referral programs used by top brands to drive customer acquisition. It covers optimizing user participation through placements on the homepage, navigation, order confirmations, and standalone referral pages. It also discusses optimizing performance by measuring sharing rates, referral visits, and conversion rates, then testing different calls to action, offers, and shared content. The document provides benchmarks and examples from companies that have achieved referral programs contributing 7-30% of new customers with a cost per acquisition under $10.