And has been now for about half an hour, judging from the last response sent to @Twitter (Twitter search is still up).

Of course, there’s nothing about any of this at the moment on the status blog.

Updates if and when they happen.

UPDATE 12:39 GMT: I’ve had it back a couple of times on Twitter.com, but it’s a fleeting glimpse at best before going down again.

UPDATE 12:45 GMT: Seems to be fully operational once more.

UPDATE 13:45 GMT: From Twitter, “We are recovering from this incident. A sudden failure coupled with problems in switching to a backup system produced a high number of errors for around 90 minutes. This made the site largely inaccessible. No data was lost or compromised during this outage.”