To add alt text on your Instagram photos, use the "Advanced Settings" link after you choose a filter when creating a post.

When you add alt text to an image on Twitter, users with screen readers will have that alt text read to them.

This guidance is meant to be a starting point to create a deeper understanding of the implications alt text can have when people are the subject of an image. As you read, it is important to note that ...

The person asking the question wanted to know whether alt text was still relevant for search optimization. In order to understand the role of alt text for SEO it’s useful to learn the technical reason ...