I've used rabb.it before. In my opinion it's only worth using if you're watching Netflix. Otherwise the virtual environment technology it's built on is too slow and the YouTube search is an absolute joke.
For watching YouTube with friends I suggest using
https://togethertube.com/, the search is much better and it's a lot faster. Though it's has a few issues like always defaulting to 480p when a new video plays and the only way to fullscreen a video is to click on it and hit "F".
The best option in my opinion is the new Skype (Skype Preview) it has an option built in to stream audio and share screens so you can just playing things for other people in a call from your computer. No lag, no search issues etc..
You can download the new Skype here:
https://www.skype.com/en/insider/