Twitter web site down; mobile apps don't work [Update: It's back up ..and down ..

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If you are trying to log into Twitter.com or check your Twitter account on a mobile device, it's likely that you can't do either right now. At the moment, the Twitter website is down and both first and third-party Twitter apps can't send or receive messages. Twitter users are used to seeing brief amounts of downtime for the social networking service, with error messages that show that the servers are over capacity. However, it's rare that a long period of downtime, such as the one that's happening today, occurs.

http://www.neowin.net/news/twitter-web-site-down-mobile-apps-don039t-work