The ability to take back tweets has also shown up on a survey asking Twitter users about features.

The evidence is mounting that Twitter will be adding an “undo tweet” feature as millions of Twitter user demand an Edit button to correct spelling errors in their tweets.

Twitter has started testing an 'undo tweet' feature which could first be rolled out to paid customers via a subscription service: app researcher Jane Manchun Wong has discovered a subscription screen tied to the feature.

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For its part, Twitter hasn't said if the feature will be limited to paying customers — it’s possible it’s not far enough along in development for that decision to have been made yet.

Twitter confirmed to CNET that it is testing the 'undo tweet' feature.

The Twitter "undo button" also doubles as a progress bar.

"Twitter is working on an app subscription for paid features like 'Undo Tweet," she said in a tweet along with a screenshot on Friday.

The ability to take back tweets has also shown up on a survey asking Twitter users about features they’d be willing to pay for, as well as in the code for the app, and CNET received confirmation today from Twitter that it is, in fact, being tested.

The feature is different from deleting a tweet which its available to all users at the moment, as undoing a tweet will eventually stop it from being sent.

Gmail offers a similar option for emails, where it provides a short window to stop messages from being sent after clicking the "Send" button.

The Twitter "undo button" also doubles as a progress bar, showing how long you have to undo a tweet before it gets sent.

The `Undo Send` button is likely to provide a 30-second window for users to recall or withdraw a tweet with typos and other errors before anyone can see it.

This will, however, be only an alternative to the 'Edit' button users have been demanding for years.