http://slidetrends.com.ng/showthread.php?tid=46&pid=63#pid63

Earlier this year, YouTube launched a new private video sharing feature for the service on mobile. After first launching in Canada and then expanding to the rest of North America, the Shared tab is now rolling out globally around the world.

The Shared feature manifests as a fifth tab in the bottom bar of the YouTube mobile apps for Android and iOS. Users can have individual threads, as well as larger group ones for privately sharing, liking, and commenting on videos. Shared videos in these threads will conveniently play in-line.

Overall, it's a decent future and I think a lot of people will use it, since it makes showing a video to someone you're chatting with way easier!