This document provides an overview of private sales and identifies key elements that have led to success for leading private sales sites. Private sales allow exclusive access to luxury brand merchandise at discounted prices through timed online events. The document examines the business models of top private sales leaders and identifies best practices around viral marketing, cart reservations, lack of site search, one-page event listings, and standardized sales event times. It also predicts future innovations in areas like fashion content, top referral networks, customer idea communities, and crowd visualization. The document provides guidance on whether private sales would be a good fit for different businesses based on factors like brand positioning and customer data.