Full details here:
https://smartdepot.com.ng/2018/01/26/youtube-new-video-sharing-contacts-awesome/

YouTube video sharing has been limited to several ways to share. Facebook, Twitter, html embed, Google plus etc. However,  none of these sharing options is as exciting as the new YouTube video sharing. You can share with all your contacts. The most exciting thing about this is the unlimited options of contacts you can share and invite. It is also not intrusive because you friends invited to the chat can accept or reject your invite.

How Does YouTube Video Sharing Work
First, tap on a video you like to share or engage friends with. You can even start a new challenge with your friends, invite other to join the chat, even add another video(s) into the chat. That's not all, you can invite all your Google contacts (already on YouTube), by sms, WhatsApp or any other app. 
Other old Sharing methods still works but you can also pick contacts from people you may know.

Get the full details with Pictures and videos:
https://smartdepot.com.ng/2018/01/26/youtube-new-video-sharing-contacts-awesome/