Share 4 Share (s4s) means that u share one's page (let's call it X) and one shares your page (let's call it Y), when X shares Y the likes of both X and Y increases, the reason behind it is that when one's favorite page shares one page it shows up in fans timeline and they get attracted towards it and likes the shared link






History:-
s4s was started on facebook, specially for anime pages which attract many fb users and gives ones page a huge number of likes. And posts reached to more newsfeeds, and earn likes.

Founder:-
The global trend of s4s was originally started by Niranjan Dev Singh a facebook teen, this idea just struck into his mind about doing so and spread the idea throughout facebook..... and started doing s4s and earned a huge number of likes, and when it got viral and some issues started on facebook regarding s4s he decided to hold back and go into darkness, he didn't let anyone know anyone about the founder of s4s, and now owns a 200k Dortmund page which he got from a trade, he has lost very huge pages ever since he returned but still he is considered as a Big Admin.

How to do it:-
In Share 4 Share (s4s) u share one's page (let's call it X) and one shares your page (let's call it Y), when X shares Y the likes of both X and Y increases. It is mosly done in facebook groups.