Alt text for images on social media

I frequently post images on various social media sites. I notice that several of my friends take the time to write text descriptions for each image for people who use screenreader software. I'm trying to be more mindful of that in my own online activities. Wouldn't it be great if there was a built-in prompt on Facebook or Twitter that allows you to write a brief description of the image every time you upload one? The same for Pinterest and Instagram.


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Idea No. 4