The explosive popularization of mobile devices such as smartphones has greatly changed the information environment of young people. On the Internet, various kinds of information are provided, and at the same time, there are many socially undesirable information. Even information that is considered socially undesirable, if you are an adult, you should judge the value yourself without limiting that information. That is the idea of "freedom of Expression "(the right of the people to know).

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... for young people in the middle of growth, there is a risk (Content Risk) involved in unexpected troubles by contact with these harmful information. In addition, risks (Contact Risk) caused by using "Dating Sites and SNS, as well as "CyberBullying" at the "Underground Portal Weblog Sites by School-Children", have become a problem particularly in society recently. Furthermore, there are risks of privacy protection and information security on the Internet, and some systems to protect young people more than adults are necessary. How to protect young people from the risks related to these information behaviors is an important social issue. In this paper, we will examine the present situation of risks concerning information behavior of young people and the effectiveness and problems of some systems concerning youth protection.