Twitter down: Social network has massive problems

The social network Twitter has been down for several minutes. Thousands of users are reporting on “AlleStörungen” about problems with the service’s accessibility.
The problem appears to be worldwide, as several users from the US and the UK confirmed to me. Twitter was already temporarily unavailable last night.
Update: 15:40 The problem has been resolved
Twitter down: What to do?
Currently, there is no option but to wait. It seems to be a server problem. Some users have already tried to reinstall the app or log in again without success. Twitter has not yet commented on this, nor has the Status page shows no problem. We will update the article continuously.
Many users are now wondering, where should I discuss the fact that Twitter is down?