When using og:image you should always also use og:image:alt (A description of what is in the image (not a caption)) to conve the essential nature of the image to users who are visually impaired.
The same is true for twitter:image, where the property is twitter:image:alt
When using
og:image
you should always also useog:image:alt
(A description of what is in the image (not a caption)) to conve the essential nature of the image to users who are visually impaired.The same is true for
twitter:image
, where the property istwitter:image:alt