Facebook is a social networking site where members can maintain a user profile, add friends and interact with them using social tools and applications, and join networks based on location, company, school, region, etc. Founded by Mark Zuckerberg while a student at Harvard, membership was originally restricted only within the campus. Eventually the site expanded to open membership to other colleges, followed by high school students, and eventually to anyone of at least 13 years of age.

Currently boasting over 200 million users around the world, Facebook is one of the most popular social networks. The site and its executive leadership have weathered many controversies surrounding international blocks, being banned in certain workplaces, privacy issues, security breaches, lawsuits from former Zuckerberg classmates, unpopular changes to the Terms of Service and several redesigns.