If software development was not a creative process then such algorithmic/IQ test interviews would be very relevant. Unfortunately for those wasting their time with such interviews it is a creative process. A recent Nobel prize in economics was given to Daniel Kahneman for his work proving such gut instinct interviews are a failure. When I first left college and was bad at software development I passed those tests, got into software firms and got my experience. Now even though I write software everyday for my clients I wouldn't pass any of those interviews. Zuckerberg is right - younger people are smarter (at passing those tests).