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Twitter works for me. Also checked against isitup: http://isitup.org/twitter.com

isitup.org is useless in that case becase the front-page returns HTTP OK/200.

No. Something is technically wrong.

EDIT: Twitter is back. Must be a glitch.

Yes, it is down. Got a message saying something is technically wrong

same for me, internal server error if already logged in

Does twitter changing it's design now?

Yes — they're currently rolling it out to everyone.

Twitter is down?