Now Twitter is currently down for planned maintenance.
According to Twitter;
Twitter’s hosting provider, NTT America, will begin scheduled maintenance at 11:00PM PT/06:00AM UTC. This maintenance will last approximately five hours.
During this maintenance, there will be periods of time when some users are unable to use Twitter. We do not expect these periods will last for the [...]

Twitter, Twitter Down, Twitter Error, Twitter Maintenance

Yes – the Twitter is down again. And been down for several hours. And likely staying down through Tuesday, June 15 until 3AM Pacific Time.
Twitter’s team is working on incorrect tweet counts. As they said on blog
Some users are noting inconsistencies in tweet counts. This is purely a display issue and the tweets are not [...]

Tweets, Twitter, Twitter Down, Twitter Hanged