This document defines Facebook and compares its advantages and disadvantages. It begins by defining Facebook as an online social networking service founded in 2004 by Mark Zuckerberg and others. It then lists some key advantages of Facebook such as it being free, allowing users to connect worldwide, and share their daily lives. However, it also notes Facebook addiction can waste time and fake profiles can be used to harass others. The document concludes by stating Facebook can negatively impact student results if overused and that employees can waste work time on the site.