Nowadays, information technology has developed a lot, applications are used more and more and in which, it is impossible not to mention Facebook, one of the most used applications today. Firstly, facebook is a place to help people earn a lot of money from livestreams or online sales, in addition, facebook also helps spread many meaningful and useful clips for life, so in their spare time young people can see these. Secondly, Facebook is not always suitable because there are many clips with violent and sensitive content that can greatly affect the thoughts and behavior of young people today. There are many notorious content creators to get views and make money without thinking about the consequences. This may cause security to take action to block this content. Without the intervention of the security agency, the regular exposure to these things will make the young people learn and imitate, causing more and more people to break the law. Third, when using social networks, if people do not know how to control their words, it can cause hysteria and quarrels online. This is quite common among young people, especially pupils and students, which can cause enmity and conflicts and then meet to talk and then fight. Finally, using facebook in your free time also has two good and bad sides, so be careful and limit it.