Abstract
Social networking service was utilized and communication with much others was attained.
New human relations which were not until now, such as a friend and an acquaintance, a hobby and taste, and an alma mater, are built by it.
On the other hand, the individual and the company have also generated the example involved in damage or a trouble by generating of slander slander, a damage caused by rumors, etc.
It has tried to establish SNS literacy through consideration of security about the prevention and correspondence to such a situation.