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We are on AWS and can scale to 50x our current capacity in minutes, as required. We (in particular @justinw) spent asstons of time and effort in a full speed sprint to get to this point before a huge influx of users happened - and we were successful and ready for it.

I promise we'll be ready for all the future ones, too. :D

Mind you, were Steemit.com to hit critical mass, you'll need a lot more than 50x :)

We control the valve with the signup queue.

Ideally, that valve should be fully open! Hope we get there soon.

At the moment it is. We haven't had any scaling bottlenecks yet, in signups or services.