As a screen reader user, I encounter inaccessible posts and articles daily. I would go as far to say that most companies and organisations don't include basic accessibility in their marketing. This article in PR Daily covers the baiscs of making your posts and articles accessible.
Check out the article on PR Daily for tips on Alt Text and Captions in your PR and Social Media.
Research — both Heinrich’s and well beyond — shows that captions, alt text and other accessibility features not only reach people with disabilities, but also reach more people who consume content in different ways and different environments.
