The document discusses applying a "Moneyball" approach of data-driven decision making to talent sourcing and recruiting. It presents data on source effectiveness from the Jobs2Web dataset, ranking sources based on the number of visitors, applications, interviews, offers, and hires per source. Social networks and job boards require many more visitors to generate a hire compared to referrals or career sites. The document advocates moving from conventional wisdom to using metrics to understand the hiring process and best optimize sourcing.