No More 20% Text Overlay Rule In Facebook Ads
As of 22nd March 2016, Facebook has removed its 20% rule. This rule had been in play for some time, Facebook also provided a basic grid tool that allowed you to check how much of your image is masked by the text.
11 Apr 2016 ... The grid tool is gone as well. Facebook now provides a rough guide, that indicates impact on reach of your ads, as a result of text on the image.