How to adapt the site for the facebook mobile application?

Question

Facebook

There are a number of pages on FB, where if you follow links from the facebook mobile application, it is not the mobile version of the site that opens, but a page in a simple interface, and the application header is replaced (regular links do not open like that) and opens very quickly.
Sample pages
https://www.facebook.com/wuzzupfeed/
https://www.facebook.com/ofigenno.cc/
https://www.facebook.com/sportsru/ (not all links work this way)
Same design everywhere .
How is it done?

Answer 1

Found. It's called Instant Articles.