This document discusses how to use Facebook retargeting to plug leaks in a sales funnel. It explains how website custom audiences allow dynamic retargeting of people who visited certain pages but not others to remind them to take the next step. Retargeting ads are shown for people who took the lead magnet but not the tripwire, and those who bought the tripwire but not the core offer. By retargeting abandoned visitors, up to 20% more people can be moved through the funnel to increase sales.