This document discusses research analyzing social media usage in Japan. It examines changes in social media users over time and how companies use social media. The research aims to understand the behavior of social media recipients and analyze Facebook pages to classify social media into types. It also describes developing a probability hierarchy model to understand information diffusion on social media and conducting statistical tests and keyword extraction to study linguistic and nonlinguistic information. The conclusion discusses determining relationship types between social media users through structural equation modeling analysis.