https://techcrunch.com/2018/11/16/facebook-messenger-watch-videos-tegoether/

Netflix and chill from afar? Facebook Messenger is now internally testing simultaneous co-viewing of videos. That means you and your favorite people could watch a synchronized video over group chat on your respective devices while discussing or joking about it. This “Watch Videos Together” feature could make you spend more time on Facebook Messenger while creating shared experiences that are more meaningful and positive for well-being than passively zombie-viewing videos solo. This new approach to Facebook’s Watch Party feature might feel more natural as part of messaging than through a feed, Groups, or Events post.

The feature was first spotted in Messenger’s codebase by Ananay Arora, the founder of deadline management app Timebound as well as a mobile investigator in the style of frequent TechCrunch tipster Jane Manchun Wong. The code he discovered describes Messenger allowing you to “tap to watch together now” and “chat about the same videos at the same time” with chat thread members receiving a notification that a co-viewing is starting. “Everyone in this chat can control the video and see who’s watching” the code explains.