Twitter announced a new premium service for users in Canada and Australia that allows paying users to adjust tweets, among other features.Called Twitter Blue, the service allows users to preview and modify a tweet up to 30 seconds before publishing it. Users can also bookmark and organize tweets, making them easier to find.Twitter Blue will also format threads, or series of tweets, into a more readable format.”We’ve heard from the people that use Twitter a lot, and we mean a lot, that we don’t always build power features that meet their needs,” two Twitter product managers, Sara Beykpour and Smita Mittal Gupta, wrote in a blog post about the new service.Twitter Blue will cost $4.49 a month in Australian dollars and $3.49 in Canadian dollars.Twitter says that more features are forthcoming and that users in other parts of the world will have access to Twitter Blue in the “near future.”