Our YC Interviews
I've helped a bunch of people prepare for YC interviews and the biggest problem by an order of magnitude is not being able to concisely explain what you actually do. That may sound crazy, but I've yet to review an application that clearly and simply states what the company is building, why it's important, and how they're going to get adoption. It seems these guys had the same issue, since Guy mentioned that they spent the first 5 minutes explaining what they do.This is a symptom of a more general problem: people severely underestimate how difficult it is to convey an idea to another human being such that they actually understand it. Being able to do so is no small task, and I wish more people would recognize the value of this skill.