Reverse engineering expert Jane Manchun Wong has dug into the code and spotted that Twitter is working on this new feature that will let users unpublish their tweets for a specified time limit. If the user publishes a tweet with grammatical errors, or wrong links, they could use this feature to reverse their action of tweeting. This ‘Undo Send’ timer will start as soon as users press ‘Tweet’ and will last for a very short time. If the timer expires, users have the option of deleting their tweet and starting from scratch.