Well, the site isn't running tests to see if the site that we think of as twitter is up, just is something responding at that web address- which if you're seeing the iranian thing, then it is.

Looks like Twitter just took down the entire front page though. Going to be a late night in California...

Except that when I ran the test the site was not responding, and many other services like http://downforeveryoneorjustme.com/ was telling me that the website was down for everybody.