Facebook has rolled out a new feature called Live With which allows you to go live on Facebook with a friend.
Live With lets you invite a friend while you broadcast live on Facebook, even if you’re not in the same place. To invite a friend, simply select a guest from the Live Viewers section, or tap a comment from the viewer you want to invite.
Your viewer can then choose whether or not to join your broadcast. You can go live with a guest in both portrait mode (for a picture-in-picture experience) and landscape mode (for a side-by-side experience).
Live With is currently available on all Facebook profiles and Pages on iOS.
source: Facebook