What does Become a Fan mean?

Become a Fan meaning in Urban Dictionary

onetime, lately, it once was the button followers clicked on if they wished to "become a fan" of someone popular on Twitter. It quickly evolved into a button that people clicked so often, out of their very own might, in order to become a fan of anything they regularly (or however) do.Following the huge success, fan pages had a good downfall. Pages that required visitors to be a fan to see a 'funny' image emerged out-of nowhere like ants during the picture of the picnic. "Become a fan" has for this reason become associated to "you'd better fan this page if you wanna see just what it's about"