Tech Twitter Blue, a paid subscription service letting users ‘undo tweets,’ arrives in the US November 9, 2021November 9, 2021Terry Collins, USA TODAYComments Off on Twitter Blue, a paid subscription service letting users ‘undo tweets,’ arrives in the US Twitter's monthly premium subscription service, Blue, arrives in the U.S. for $2.99 for "power users" after a five-month test in Canada and Australia.