Nowadays, many children have their own smart phone or laptop and their parents don’t spend enough attention for them, so children can’t manage their time between study and entertain. You know what, most children around the world are using social network, especially Facebook. I, as my friends, are using Facebook because it has a lot of advantages with us. For example, it helps us contact with people all over the world, updates the news, etc. Nevertheless, Facebook also brings us negative effects and teenagers shouldn’t spend too much time on it. Firstly, in our ages, Facebook is not a good choice because there are many harmful information for us, like crime, violence, sex. Besides, Facebook can contact us with many people, including good and bad people. If a kid use Facebook, then a bad guy can use them to do illegal acts. Moreover, when children spend all their free time on Facebook, they will become antisocial and their health will be affected, so they can't study well. To sum up, kids shouldn't spend too much time using Facebook, then they should use that time for do outdoor activities, help their family and do their hobby like art, sing, etc.