How to? - Videos on Facebook with Links

Hey Guys!

So, weeks ago, or maybe months, I was able to upload a link to my page on Facebook, and then, change the image for a Video. This way, you could click on the video and see it, but if u want to know more about it, you touch the URL and voila! In the website.

I know some people is using this in to viral videos, for example this account i saw today:

However, what i saw today was even strange, because it was a big company doing it:

Ok, the only normal way to do it is paying, so u can add a button to the video o photo u are promoting. However, since i could do it some months ago with nothing in particular, i was wondering if this is a thing and i dont know about xD

What do you guys think?