I'll wait until the site is responding faster/not erroring to be sure but if it's really as it appears, this is amazing. Attractive customizable design is one thing, but real logins, real graph relationships, real feeds, real filtering for mentions, user photo uploads, potentially real messaging, all without any coding would be (is?) really amazing and covers 99% of all the site creations any laymen could want.

It doesn't need to scale especially well for the vast majority of customers. If your first reaction is "this doesn't scale" or "this doesn't eliminate programmers" you have to be a professional point-misser. I'd want to see how intuitive the interface for making this is but it's cool stuff, and as it matures I'm sure will only get more interesting.