When killing notice videos of Japanese hostage by ISIL has been published in the January 20, 2015, a photomontage of Japanese Twitter user has processed the part of the video, relentlessly to Twitter account you think that the ISIL persons concerned was sending. Had been highly regarded abroad despite in Japan is a critical evaluation of this case. It was carried out re-examination of educational content related to information ethics in response to this case. And it is proposed to be added to educational content on SNS for convenience of anonymous communication. Specifically, the use of a SNS normally, some degree of anonymity is ensured. However, it is no longer anonymous to the moment the post content is may the manners violations and criminal acts, it is a learning content that could be personally identifiable.