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By that metric, cricket is the most popular sport in the world, because it's the most popular sport in India, even though it's only widely played in a few countries.

It's the question of mean vs median. When talking about worldwide popularity, I think most people implicitly consider a median-like metric.

hmm, maybe entropy is a better measure then total count

Yeah, but that still does not mean that most English speakers come from China. It might be true, but it does not follow directly.

That's like saying the most popular social media site in China also has to be the most popular social media site in the world.

It's like saying it except for where you say "has to be."

How is it math? It totally ignores that a movie star could be well known over many countries in the world. Considering Hollywoods reach, I wouldn't be surprised.