If you are a regular internet user, you've surely heard of this popular social network. Facebook was developed by Harvard student Mark Zuckerberg who originally named it TheFaceBook. Starting off as a university network, Facebook soon became one of the most-trafficked websites in the world with millions of users. Mark Zuckerberg dropped Harvard to dedicate himself to the site. Facebook was built on PHP-MySQL technology and quickly became the most popular PHP website ever built. Its domain, facebook.com, was purchased for $200,000.