https://techcrunch.com/2020/03/24/how-instagram-co-watching-works/

Now you can scroll Instagram together with friends, turning a typically isolating, passive experience into something more social and active. Today Instagram launched Co-Watching, which lets friends on a video chat or group video chat browse through feed posts one user has Liked or Saved, or that Instagram recommends.

Co-Watching could let people ooh, ahh, joke, and talk about Instagram’s content instead of just consuming it solo and maybe posting it to a chat thread so friends can do the same. That could lead to long usage sessions, incentivize users to collect a great depository of Saved posts to share, and spur more video calls that drag people into the app. TechCrunch first reported Instagram was testing Co-Watching a year ago, so we’ll see if it managed to work out the technical and privacy questions of operating the feature.