http://www.newsweek.com/twitter-blue-subscription-service-launches-australia-canada-undo-tweet-1597519

Twitter has launched a new paid-for service that allows subscribers to review their tweets before they go live and to select color themes for the app.

Twitter Blue launched in Canada and Australia on Thursday and while a further rollout is likely, there are as yet no details on which countries the service may be extended to and when.