Edit: After half day, my wife’s Mac started having the same problem. I have then applied the solution that I found in the Apple
Twitter Is Currently Down
We have tried to access Twitter only to find out that the site is currently down. The official Twitter website is not loading and also new tweets are not appearing on the iOS app or the Mac app. The outage has been for the last 30-40 minutes affecting everybody worldwide
We have reached out to Twitter to comment on the situation but have not heard anything back at this moment.