This document provides guidance on setting up and using Facebook's Offline Events tool to measure Return on Ad Spend (ROAS) from offline sales generated by social media campaigns. It outlines how to track offline events by setting up event tracking in ads, collecting customer data, mapping data to event types, and reporting offline events and sales in the Campaign Dashboard. Tips are provided such as including country codes, uploading only new data, and using offline events to demonstrate the impact of digital ads on offline sales.