Facebook is the most popular application. It is a social networking service launched on February 4, 2004. It was founded by Mark Zuckerberg . The website's membership was initially limited by the founders to Harvard students, but was expanded to other colleges in the Boston area, and by September 2006, it was expanded to everyone. Facebook has over 350 million active users. More than 35 million users update their status each day, with more than 55 million status updates each day. The best thing about this application is it easy to communicate with other people and you can use it everywhere on smartphone, tablet or computer. So if you are bored, don’t forget to use Facebook.