Interesting, wouldn't have expected the viral coefficient to go so high with such a minimal change. Did you just say that if you invite your friends, you'll get in sooner?

Care to share the exact copy you used? When I check your website, it redirects to http://sanfrancisco.usehipster.com/ and just says "Enter your email and we'll put you on our invite list." A/B test?

Also, I wonder how one might inch that viral coefficient up and above 1.0, making it a truly viral feedback loop.