I've never considered there to be one, although I'm open to the idea.

It's easy for me to recognize an Ameican pop culture or an Anglo pop culture, and the favor each show for certain imports over others, but those don't seem nearly so universal as your usage of "global pop culture" suggests.

Latin, Arabic, Russian, Chinese, French, Indian/South Asian, etc each represent huge "pop culture" markets of their own but also each have their own import biases.