How did Savings.com grow click-through rates 88% within months by using a dynamic-content engine to weigh variables and send subscribers emails tailored to preferences? Five months after launch, the targeted emails increased average engagement metrics across the company's more than 2 million subscribers. He explains how the coupon and deals site uses an algorithm to select offers it sends to subscribers each day, and how it sifts through hundreds of thousands of deals to select 20 or less for each email.