In-geon Shin presented a paper entitled "Ten-Minute Silence: A New Notification UX of Mobile Instant Messenger" at CHI 2019, Glasgow, Scotland, UK. This paper highlights a new rule of mobile instant messenger called Ten-Minute Silence. This new rule provides one notification per conversation session, which is a group of consecutive messages, rather than per message. This paper reports themes about the changes in the participants' messaging experience and findings on new social norms for the participants’ use of mobile instant messenger. This work was done by In-geon Shin, Jin-min Seok, and Youn-Kyung Lim.