the complete video in context.
After seeing the entire exchange, I am totally satisfied with Eric Tseng's and Zuckerberg's explanation. It's not that the iPad isn't mobile - it's just that the iPad has no bearing on what has been already discussed at this mobile event and Facebook is not willing to spend time and money on a platform that is still growing.
With that said, we know Facebook for the iPad isn't coming anytime soon. So, go ahead and spend the $.99 for Friendly for Facebook [iTunes link]. I know I've been holding off on getting it since I know Facebook could make a free app that's even better than what's in the App Store right now. While a lot of people are content about using Facebook in a browser, we know an iPad app could be downright awesome. While Friendly for Facebook isn't perfect, it's very usuable and, according to user comments, it has been getting better with each update.