No need to check your internet connection and for many a surprise not even to see the twitter ‘fail whale’ when this happens, but twitter is down.
It is currently suffering an ‘ongoing denial of service attack’. Which unfortunately I’ve seen too often with other services recently. Whatever your reasons for using twitter, be it personal or business I’m sure it won’t be long until it’s back up. Hopefully just a matter of hours until full service is restored.
To check for further updates you could visit: http://status.twitter.com/ . However perhaps we all should leave the service alone for a few hours to deal with the crisis, put on the kettle and get on with some work.