One time, not too long ago, it used to be the button fans clicked on when they wanted to "
become a fan" of someone popular on Facebook. It soon evolved into a button that people clicked so often, out of their own will, to become a fan of something they used to (or still) do.
Following the huge success,
fan pages had a great downfall. Pages that required people to become a fan to see a 'funny' picture emerged out of nowhere like ants at the sight of your picnic. "
Become a fan" has hence become synonymous to "you'd better fan this page if you wanna see what it's all about"