Twitter has said it's testing an edit button internally, and it says it'll be expanded to twitter Blue subscribers in a specific country in the coming weeks.
The current test is for tweets to be edited up to 30-minutes from tweeting, and will come with a timestamp and label so users can see the original is edited. Users selecting the label will be taken to the tweet's history.
Given that this is our most requested feature to date, we wanted to both update you on our progress and give you a heads up that, even if you’re not in a test group, everyone will still be able to see if a Tweet has been edited.
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blog.twitter.com...]