Facebook is one of the most popular and attractive social networking websites for teenagers. It was created in 2004 by Mark Zuckerberg, a student at Harvard University. Facebook makes it very easy to connect with friends and relatives and meet people with shared interests. It also allows users to quickly share photos and chat with good friends. People often upload funny or sometimes strange content. However, users must be at least 14 years old to sign up, even if they think they are the most mature person in the world. The summary encourages enjoying Facebook while being respectful to others on the site.