The document discusses the biographies and accomplishments of Mark Zuckerberg and Jack Dorsey. It provides details about their early lives, education, founding of Facebook and Twitter, and their subsequent successes. Both Mark and Jack showed an early interest in programming and dropped out of college to focus on developing their ideas. Mark created Facebook in 2004 and it now has over 2 billion users. Jack created Twitter in 2006 and it has become a major platform for public discussion. Both entrepreneurs have become billionaires and globally influential through their social media platforms.