Last week the new Reaction buttons were introduced in order to have alternative ways 'to like' something. But if you change the Facebook language to 'English Pirate' you'll see a connection to the pirate anime One Piece.
It's not only a connection to One Piece - more to a special character: Brook. His famous 'Yohohohoho' laugh found it's way in a short version to Facebook.
Coincidence or did the devolopers actually had Brook in their mind?