I've heard that a few major social media sites have adjusted how they handle alt text in the past year or so, but since I don't personally use a screenreader, I'm not sure what best practice is at this stage. For Facebook, I can edit alt text (and do, especially when posting an image with text, like a screencap from an informative Instagram post or a Tweet)—is it redundant to then add that same text back into the body of the post?

I also notice people comment on these sorts of image with text posts by putting the text in the comments, which seems possibly confusing, but maybe not. (Same for Twitter images—it still seems standard for people to add alt text but then also follow up with a separate, longer description for basic text images. For some reason, I thought the addition of editable alt text was so that the description text could be tied to the placement of the image and reduce redundancy.)

I'll be doing a lot more of this coming up, so I'd just like to try to be thorough! Appreciate any feedback.