LINE DEVELOPER DAY 2017 A-9 "We will discuss two case studies for data analysis conducted by the LINE Security Department. The first use-case is explanation of how we acquire system logs pertaining to the infrastructure (servers, PCs, and the network), the system that quickly detects unauthorized access, heavy loads, information leaks, and other incidents, and the structure of the platform. In the other, we will discuss the current status of spam countermeasures on LINE and the anti-spam system that analyzes spamminess and automatically blocks based on user reporting data."