This document summarizes research on attracting and retaining teens aged 13-17 from California on a health-focused online social network. The research involved surveying 692 teens who were invited to participate in the online intervention, of which 165 became active users. Various recruitment strategies were tested, with holiday cards having the highest success rate at 8.8%. The site included social features and health-focused activities and themes. While some strategies engaged teens, high turnover remained a challenge without constant new content and events to engage youth in the short-term.