I do this for my tweets nowadays. Even when it's about Blender, which isn't really suitable for visually-impaired people, it just makes sense to describe images.
@FacesPics For accessibility to the visually impaired, who do use social media, please add alt-text when tweeting images/gifs, especially when they are the point of the tweet. Twitter allows descriptions up to 1000 characters per image/gif.
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