Use Streaming Online Video/Live As Source In OBS Studio Is this possible?

Use others or your own Facebook or YouTube live stream as source in obs or any broadcast software and then broadcast it on another page or channel.
This would be possible using OBS's BrowserSource.

First, find the embed code for the stream (in YouTube you can click "Share" and then "Embed"). Find the src="" and copy the URL that's inside the quotes. In OBS, create a new Browser. Paste the previously copied URL into the URL field, and set the Width and Height to your canvas size (or your preferred size).

If you need to press a play button, you can right-click the Browser and click Interact.

I hope this helps!