Paid Twitter – in the Twitter Blue version – debuts in Australia and Canada. The monthly subscription costs 3.49 Canadian dollars and 4.49 Australian dollars (about 2.9 euros) The service will offer options such as the ‘undo’ button, which will allow users to change the preview of the message but not to modify the tweets already published. Twitter Blue will offer the Bookmark functionality to organize the messages and the Reader mode that will allow you to read more easily the particularly long threads. The implementation of the paid version will not result in the disappearance of the free version. Twitter Blu is expected to land in the US for $ 2.99 per month and in the UK for £ 2.49.