This document discusses how to use Facebook advertisements and pixels to build an email list. It recommends adding Facebook pixels to web pages to track visitors and create customized audiences. Advertisers can then retarget past visitors with advertisements to collect emails or drive other conversions. Starting with low-cost traffic and free content allows advertisers to serve visitors before charging them with retargeted ads later. Monitoring insights and optimizing campaigns is important. The overall strategy is to offer value first through free content or low-cost ads, then retarget those same visitors with more expensive ads asking for emails or other conversions.