https://techcrunch.com/2018/07/25/facebook-what-is-a-watch-party/

For the past few months, Facebook has been testing something it calls “Watch Party”. It’s a feature that would let Facebook Groups host shared video streaming sessions, with everyone in the group being able to see/comment on the same videos at the same time. Take the Facebook Live concept and swap in a queue of pre-selected videos to make a sort of ad hoc video channel, and that’s a Watch Party.

Today the company is rolling the feature out to all Facebook Groups.