It’s no secret that Zuckerberg no longer writes as much code as he did when he founded Facebook. And it’s not hard to see why. As CEO and chairman, he doesn’t have the time. However, despite being tied up with managerial projects and steering the one-billion-passenger ship that is now Facebook, CEO Mark Zuckerberg, who in May pledged to spend some time each day programming, still jumps in the bunker to oversee any code that relates to the company’s most important feature: the News Feed. While all new code changes are reviewed by one or more engineers—and vice president of engineering Mark Schroepfer—Google employee Yee Lee spoke to a number of Facebook employees and discovered that Zuckerberg personally reviews any changes to the News Feed. Makes sense seeing as how that’s the part of Facebook users interact with the most.