Got pretty helpful feedback. But that wasn't the only thing.

478 people requested invite out of 755. 63% conversion rate. Almost 9K unique visitor visited our website. At some point in the morning I was seeing 400+ active users on the website. Unbelievable. 35 people registered without telling them how to register. ( You cannot register directly, there is only a login form - but they figured out a way :) http://imgur.com/Kbf9J

6K people visited directly from Hacker News, 1K from Twitter ( I guess Popular Hacker News post )

I was afraid that Nginx might not hold up, but that was not the problem. I wasn't ready for it! Stuck on my chair from 08:00 am till 02:00 pm. I am still feeling anxious.

People tweeted about us without using our application. https://twitter.com/#!/search/realtime/followords (even in Spanish)

Today another lesson learnt: So if you are working on a project. Release it. Ship it. Let people tell you how much your project, website or tagline sucks. Embrace it. Think about it, thank them and move on.

I need some sleep, tomorrow is another great day. Thank you all for your contributions.