https://www.cnbc.com/2017/11/30/why-facebook-ceo-mark-zuckerberg-thinks-the-optimists-are-successful.html >Mark Zuckerberg is the ultimate success story. He's built one of the most powerful technology platforms in the world and at 33 years old, he is worth more than $70 billion, according to Forbes. >Tuesday, speaking from New York at the Facebook Social Good Forum, the billionaire revealed one of his favorite sayings — and it shows a lot about the way the entrepreneur operates.