What ads?

I’m genuinely puzzled. I’ve been using FB since March and until last month I had the standard membership rather than FB Plus, but I’ve never had to watch an advert. I’m here on the website, I go to the workout I want to do, I press play, done. No ads. Nothing to do with YouTube as far as I can see.

Is it something to do with me being in the UK rather than the States? Now that I’ve got FB Plus I can see that the player has changed, but it makes no difference to my viewing; it just looks slightly altered.