Facebook Page that calls itself Nike Mercurial claims that you can win expensive Nike shoes just by sharing and liking a post and adding the comment “Win”.
The Facebook Page is fraudulent. It is not associated with Nike in any way and it is not giving away any shoes. There are no prizes and no winners.
The bogus Facebook Page is a scam designed to collect large numbers of Facebook likes as quickly as possible. Once the Page has gathered a large number of likes, it can then be reused to launch further scams. Or, it may be sold on the black market to other scammers.
Like-farming scams are very common on Facebook.
This Hoax-Slayer YouTube video explains more about how like-farming scammers operate: