Some shows get more attention than others, plain and simple. Big, blockbuster series like Game of Thrones and The Walking Dead garner an unprecedented amount of media attention, but what does that actually translate to? Just because the shows are big on the Internet doesn't mean they're necessarily the most popular on TV...in fact, it's actually quite the opposite.
Whereas Game of Thrones is basically worshiped online, it's not quite as popular when it comes to regular TV broadcasts - it's not even in the top three shows on television. Neither are other Internet-popular shows like Flash or Gotham - for the most part, television is still dominated by sitcoms and police procedurals.
It's true: the most popular show on television is NCIS.
Will this new information completely turn the Internet on its head? Will Internet-goers finally accept The Big Bang Theory into their hearts? Will NCIS be as big as the Marvel Cinematic Universe someday?
No, of course not - but it's a great example of the fact that, just because the Internet likes something doesn't mean it's the majority opinion.