This document provides the minimum and recommended creative specifications for Facebook ads across different placements as of October 14th, 2013. It lists the specs for elements like text length, image ratios, and image sizes for various ad types including page post photo/text/video/link ads, offer ads, event ads, page like ads, mobile/app ads, and domain ads. The recommended image sizes are larger than the minimum to ensure highest resolution, and any images smaller than the required minimums will not run as ads.