“Ads that have more than 20% of text in their image won’t be approved to run in News Feed. Too much text can look like spam and make people think that your ad is low quality. Make sure to use the headline and body of your ad to tell people more about why you’re advertising and what you want them to do. Learn more about Facebook’s Advertising Guidelines.
Upload an image [below] to see how much text you’re using. After you upload an image, we recommend marking five boxes on the grid in order to determine whether your creative is likely to be acceptable to show in News Feed.”