For Global Accessibility Awareness Day (May 19th), Disability:IN created this guide on how to make social media posts accessible. Social media has enabled us all to share content, however most of the content we share is not accessible to all. Many posts have images with no description, meaning that the visually impaired can't access the post. Others include videos without captions, making the audio on the video inaccessible to people with hearing difficulties.
Help make the world ever better by making your content accessible to all.
While Alt Text is more high-level, Image Descriptions (IDs) are more detailed. Included in the captions of posts on Instagram, Facebook, and LinkedIn, Image Descriptions should include salient features and identities of individuals (gender, race, disability identity, etc.) as well as patterns and colors of clothing and environmental details. It is also a best practice to include video descriptions of the action and imagery shared in video posts. Image and video descriptions should always be used in addition to Alt Text, never as a substitute.
https://disabilityin.org/resource/creating-accessible-social-media-content/