I am watching without being logged in. Try this link to the main page, then scroll down to where you see the video with the red "live" box in the top left corner and try to play it from there and see if that works any better.
https://www.facebook.com/worldpools...J6SrB6QDW7TvBLgxFZELHC57R8s2008jOWzP9-mnD_-6k
Also, whenever you get that annoying huge "must log in" pop up just click on "not now" at the bottom of it to sort of minimize it where it takes up less space at the bottom of the screen and then just proceed as normal and you will be able to watch the video regular size or full screen without any problems.
Stop it with those facts.