Many young people are going to communicate by SNS on a daily. On the other hand , teenage users , not a few also would have been involved in serious trouble , such as bullying and incident . Then teachers although prohibit using SNS and impose tough guidance on individual case . But we consider it is necessary to shift "prohibit using SNS ", to "noticed the risk , to use safely ". We propose manga and teaching methods for using SNS safely. We experiment with those for college students, As a result of experiments , they also felt the effects of this approach .