Twitter has announced it will launch a world-first subscription to the platform in Australia and Canada. Called Twitter Blue, the social media giant said its new subscription model will meet the needs of prolific Twitter users, with the power to undo a tweet or to save and manage content. “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,” the social media company said in a blog update on June 3. “Well, that’s about to change.” The subscription costs $4.49 (US $3.86) per month and offers three new features. Undo Tweet: The most exciting part of the new offering is that it gives users 30 seconds to click “Undo” button before posting a Tweet, reply, or thread to the timeline, allowing users to preview and revise Tweet, although an “edit” button is still not offered. Reader …