I like the board layout and how you pull the social info. But I don't understand focusing on "technical interviews" - that's just illogical to me. A typical 100+ person company's technical interviews happen much less frequently than their non-technical interviews, don't they? Maybe that's not clear - in other words, for your typical company that has technical employees, don't those same companies also need to hire non-technical employees as well? Of course they do. So... if I, the hiring person, use your tool for the technical interviews, what tool do I use for the non-technical interviews? If the answer is, "Uhhhh..." or "A different site", then that's it - I won't use you. I don't want to have to use multiple sites/tools during hiring; I want to either use one site or no sites.

Here's an idea - maybe you open up the board layout/social part for all interviewees, and make the coding/testing aspects an in-site purchase/option? I don't know - it's your business and all - but it seems to me that people will pay a premium for those extra features:

* Coding tests

* Intelligence testing

* Custom Q&A with grading (like @staunch said)