Presenting duos have been a familiar feature of traditional broadcast television, but the single (smartphone) camera restrictions of livestreaming apps have tended to focus on single broadcasters.

Not any more, at least on Instagram. Facebook's app has rolled out a feature to all users enabling them to start broadcasting live video in their story, then invite a friend or viewer to join them in split-screen mode.

The feature was announced earlier this year when it was being tested, but is now available to all. It's also a feature we expect to see quickly adopted by influencers on the app.

One use will be for collaboration broadcasts between two different influencers. Another could be livestreams where they invite one fan at a time to share the broadcast, perhaps for live Q&A interviews.

"You can remove your guest and add someone else at any time, or they can also choose to exit on their own. Share your live video to stories when your broadcast has ended, or choose “Discard” and your live video will disappear from the app as usual," explained Instagram in a blog post.

"When someone you follow is going live with a friend, you’ll see two circles stacked together in your stories bar. You can tap on it to watch, and like and comment as you follow along."

Collabs have been a key part of YouTube's influencer ecosystem for many years now. Perhaps we'll see them becoming a more prominent part of the livestreaming world too, following Instagram's move.