The document discusses a loyalty program called Sweet Tooth that uses targeted email, badging programs, tiers and levels, social referrals, gamification, and points programs to increase customer engagement and sales. Analytics show overall conversions increased 25% from April to August, and the loyalty program influenced 2.6% of all sales and 6.5% of sales for a specific product. The program also uses extensions for Google Shopping and affiliates as well as automated and transactional emails.