Facebook was founded by Mark Zuckerberg as a social network for Harvard students. It has since grown to over 1.7 billion users worldwide who visit daily. Facebook started as a way for Harvard students to share photos and information but quickly grew in popularity, crashing after only a day when it reached 20,000 users. Though Zuckerberg did not anticipate how popular it would become, Facebook is now valued at over $85 billion with headquarters in Menlo Park, California employing thousands in a high-tech office environment.