Facebook Ads has a rule that says no more than 20% of an ad image can contain text. It’s broken the hearts of many would-be Facebook marketers trying to get their ads approved. The secret to getting your images approved is to play within the lines – literally – by using a 5-by-5 grid template to construct your ad images.
https://www.contentharmony.com/blog/facebook-ads-20-percent-grid-template/

