The last solution, Limit the number of social networks. Young people should use social network in work and personal life only. Young people are no need for many different network sites. In fact, young is no need for even 2 sites which do the same thing. Choose Facebook or Line, or not both. Young people should use these tools only when after study times , or free time. This will not only save you time and increase productivity, but will build self discipline as well.