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I don't have an account and it played fine. No explanation of why tho.

I think it depends on what country you're in. In some countries, they have to block pages if you're not signed in for legal reasons (since they can't legally track you).

Another poster shared a direct link to the CDN, may help: https://video.xx.fbcdn.net/hvideo-xlt1/v/t42.1790-2/12709279...

I don't have an account and it played just fine. Don't know why though because normally I get a login page like yourself.

Here's a copy...

http://ozimg.s3.amazonaws.com/video/RF_energy_through_jumper...

which I will remove at some point

You could try unblocking Facebook domains if you're using Privacy Badger.

I got a login screen that popped up after a while. Pressing ESC got rid of it.