I didn't see it this morning, but seeing this now and just signed up for the beta. I'm <i>still</i> not entirely sure what it does, even after reading the linked thread, but I try to do whatever I can to support all the 'Show HN' threads, so even if it sucks, you've got my registration (and I'm not presuming that it will suck.)<p>Nginx is almost certainly not going to be your failing piont, and can certainly scale to beyond 400+ active users, assuming that it's configured correctly and on decent hardware. Your database could crash, or one questionable join could tear the whole thing down, but Nginx is probably the least likely component in your stack to fail.<p>As for the lesson learned, that's spot on, and one that I waffle on every now and again, even though I've done it and know it to be canon.<p>Best of luck. It's a space I've got a lot of experience in, and 'interestingness' vs. 'importance' isn't really gotten <i>right</i> anywhere yet. Hopefully you've nailed it.