They are pages that people become fan or like because they show quotes every day or funny pictures etc etc. So when they get thousands of likes or fans they earn a lot of easy money from all the likes and fans. Just like Youtubers make money from views and subscribers. I know this is not on topic but are you in German/ French/ or Italian speaking Switzerland? Also do you speak a 2nd Swiss official language? I ask cause I am always curious of bi lingual countries like Switzerland and Belgium.
Whoops, somehow I missed your reply. Sorry about that.
The money doesn't come from Facebook itself, but from affiliate programs. That doesn't necessarily rely on likes or fans, but more on people clicking through a link that you post to see the offer from the affiliate. See here.
As for me, I'm located on the very border of the Swiss-French part of Switzerland. Being English, Swiss-French is my second language.
Given my location in Switzerland though, I should really work on my Swiss-German - I'm on the "language border," where the languages switch.