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it's absolutely ridiculous that you can't add alt after posting. Which is usually around the time I remember to. But then this is from the platform that thinks an edit button is just way too radical.
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It's rolled out to mobile web!
Twitter accessibility settings screenshot containing (among other unrelated items):

"Media
Receive image description reminder
Enables a reminder to add image descriptions before a Tweet can be sent."
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Edit button would so be abused. Even here. E.g. to make it look like folks liked something hateful, or use their RT for reach, by recontextualizing it with new alt text or just adding unrelated bad alt text.
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I'm sure that would become extremely common. Most people are going to take the money and are willing to advertise something that may be a scam, etc. That's one of the least harmful ways I can see it being abused. I think it'd be one of the most common things that would happen.
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