Why do we use the Internet and mobile phones? The Internet can powerfully leverage our ability to find, manage, and share information. We gradully depend on it and we can't even live without it. We first use it to save our time, howerver, it is now becoming a powerful time killer these days. Our life style have somehow been changed by online communities like Facebook or Twitter. They kill the time which should have be used on working and reading, even on traveling and footballs. The mobile phone is another time killer, which seems to be wilder in China, Japan and korea. Sometimes I really miss the days when mobile phones can be only used in calling and sending messege. But now, however, we are surfing the Internet and playing games on them. We always say that we can choose our way of living. However, science and technology is holding our time gradually. How can we get rid of it?