Facebook has launched a new tool for iOS that can help blind, English-speaking users make sense of all the photos people post on the social network. It's called automatic alternative text, and it can give a basic description of a photo's contents for anyone who's using a screen reader. In the past, screen readers can only tell visually impaired users that there's a photo in the status update they're viewing. With this new tool in place, they can rattle off elements the company's object recognition technology detects in the images. For instance, they can now tell users that they're looking at a friend's photo that "may contain: tree, sky, sea."