Mark Zuckerberg was only just 19 when he built Facebook - the social media giant, out of his small Harvard campus dorm room, and changed the world and the internet forever. Facebook has thrived for more than a decade, after an extraordinary growth in size and influence. By connecting people, building community and bringing the world closer together, he has succeeded far and wide, and has built an empire. The Internet entrepreneur, and tech innovator became the planet's youngest billionaire at 23, and created one of the world's most popular social network.