I really like the color combination and design you went with - clean, simple, and friendly!

I do have suggestions for the sign up form:

- The warning message is too long, you dont need to explain people that in beta version not everything may be working (especially if you are only targeting HN crowd)

- Change "Facebook Addict" & "Online Hermit" and their description. I see that you are trying to give your product some character and emotion but on Sign Up page this just over-complicates the process that should straightforward and intuitive. As a user, I have seen a thousands of Facebook vs. roll your own prompts to sign up and wont read the description below.

- The "I want some privacy!" box also seems redundant to me. People who care about privacy wont use Facebook and sign up directly.