Twitter is down. Is this a sign of immaturity or genius?

From the ‘not available now‘ files:

Twitter is down right now – it’s part of a scheduled maintenance window that started at 5 PM ET. This was rescheduled from an overnight window to enable continued discussion in Iran over Twitter as my colleague Alex Goldman reported earlier today.

That’s all fine and nice, and a brilliant altruistic move- but right now, I’m suffering from Twitter withdrawal.

But wait,  I understand that it’s a maintenance thing from Twitter’s carrier NTT, but does that mean that Twitter is not using multiple carriers?

Does it mean that Twitter is not distributed?
Does it mean that Twitter has a single point of failure?

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