It was shut down by a group not happy with their position.
[cbsatlanta.com...]

Today’s turbulence explained [blog.twitter.com]

Not how we wanted today to go. At approximately 9:00am PDT, we discovered that Twitter was inaccessible for all web users, and mobile clients were not showing new Tweets. We immediately began to investigate the issue and found that there was a cascading bug in one of our infrastructure components. This wasn’t due to a hack or our new office or Euro 2012 or GIF avatars, as some have speculated today. A “cascading bug” is a bug with an effect that isn’t confined to a particular software element, but rather its effect “cascades” into other elements as well. One of the characteristics of such a bug is that it can have a significant impact on all users, worldwide, which was the case today. As soon as we discovered it, we took corrective actions, which included rolling back to a previous stable version of Twitter.

Twitter's been basically inaccessible by web users for a long time now, particularly by those using Chrome.

meh / bof

@Panthro
Don't understand your statement, Today's 06/22, I use Chrome and since 5am did not encounter any trouble.

I just mean generally. I always have problems logging in/out of Twitter, viewing profiles, doing just about anything while on web version using Chrome.

Bizarre, I use Chrome on both a XP pro machine and Wins 7, never had a glitch.
Wondering if other users noticed something similar?
Anyone...

This is quite timely as I've been warning about too much centralized activity with sites and users getting too dependent on shared services using OpenID and other centralized services.

Both users and sites depending on 3rd parties like Twitter, FB and Google will be toast when major outages like this occur for long durations and the effect on the global web economy could be devastating if adoption gets too ingrained into the internet ecosystem.

Mark my words, too much centralization is going to come back to bite us in the hind quarters.

It is true, in Turkey we couldn't access the site. very bad situation.

ecevher, Welcome to WebmasterWorld!

henry0, thanks. I am new here and WebmasterWorld contains important ideas.