Facebook started by a student who wanted to stay in touch wiht her friends. Now, facebook is five years old and is a billion dollar buisness. Mark Zuckerberg was 19 when he started this website and in a day, more than 1,000 people from Harvard signed up. Five years later, over 150 million users have signed up for what Zuckerberg wanted to be a way to stay conected with his friends. 15 million people are on Facebook every day, 5,000 friends and have about 850 millon pictures. But the average amount of people have about 120 friends. Mark Zuckerberg is the youngest billionare because of this website. Five years later, it is standing strong and better than ever!
http://edition.cnn.com/2009/TECH/02/04/facebook.anniversary/index.html