[Suggestion] Page to have multiple private chats open at the same time

I had an idea to potentially make a page or interface where you can add multiple private chats. 
This way you could choose to add people to this group-page and you'd be able to chat with multiple people at once without having to swap between conversations. 

Additionally, you would be able to resize and move around the chats. 

I've used my professional ms paint skills to illustrate what I mean. I hope it's somewhat clear.