YouTube Messages was a direct messaging feature that allowed users to share and discuss videos one-on-one and in groups on YouTube. Launched August 7, 2017; shut down September 18, 2019 — it lived 2 years. One of 37 Google products killed in 2019. https://9to5google.com/2019/08/20/youtube-killing-messages Data: Killed by Google (killedbygoogle.com, MIT).