Facebook founder and CEO Mark Zuckerberg came up with the idea with the help of some roommates in his Harvard dorm room. Five years later, the 24-year-old is reportedly worth close to $1 billion. "It started off just at school, with just a few thousand people," he says. "We never thought it would be this big ... [but] everyone wants to stay connected and share with family and friends and people around them." 

Mark says one of the best things about Facebook is that people can use it in whatever way they choose. "I use the site to stay connected with my family [and] to hear news about what's going on," he says. "My sister just got married last year, and she used the site to post photos and videos of her wedding to connect with all the people who couldn't make it. But people are using it all different ways, and it's really exciting to see."


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