An Interesting Study about EG on different Social Media

I always knew that Instagram was having the best engagement possible in comparaison to other platform , but i was really surprised when i saw that Facebook have better overall better engagement than Twitter i thought Facebook have the most awful organic reach , and that they are just a pay to play platform .

What do you think about the study is it legit and is it still worth to grow a page on Facebook for the unique goal of enagagement not sales
(as i know they are the best in terms of making money because of the ad platform )

Here is the link of study :