This study investigated the phenomenon of posting photos of bookshelves on social networking services (SNS) and aims to identify the underlying characteristics and intentions of this behavior. Data were collected from Twitter (Present “X”) hashtags, and co-occurrence network analysis, correspondence analysis, and hierarchical cluster analysis were carried out.
　The findings reveal that bookshelf posts on SNS primarily relate to book collecting and purchasing but also display a diverse range of content, including the desire for interaction with others. Two types of interactional intentions were observed: general interactional intentions for broad interaction and limited interactional intentions for interaction within a specific genre. Additionally, the desire for approval from others through self-presentation was identified.
　Posting bookshelves on SNS represents a form of interaction that reflects a blend of SNS communication characteristics and the characteristics of book-based community in real life.

　Laws concerning the use of QR Code and URL in textbooks has been established in Japan, and QR Code are now printed in textbooks and supplementary materials. This has made it easier for teachers and students to obtain relevant information more freely from outside, beyond the physical constraints of paper. The results of the survey revealed that (1) QR code aren't widely used by teachers and students, (2) The reason for using QR codes is the convenience of QR codes, and (3) The reason for not using QR codes is that there is no need for QR codes, and feel the risks and inconvenience associated with their use. The study concludes with a summary of the findings and a discussion of the prospects.

　This paper investigates a number of materials from Uji Syuui Monogatari, examining changes over time in the narratives included in postwar Japanese language arts textbooks for high school students. Although there were few literary teaching materials in the immediate postwar period, these gradually increased due to the growing interest in literary research. Over time, literary materials were increasingly adopted for educational purposes, such as familiarizing students with narrative constructions. However, the interest for the works in literary research has changed over time. Therefore, it was suggested that there are some educational material values that do not function effectively in the present day. As an issue for Japanese Language Arts education, it is important to create value as educational content by such as comparative analyses of narratives or the same characters across narratives.