It was US only as you had to have a .edu email address to join, which most universities around the world did not get as it was mostly a US thing. It took forever for them to open up to non-US universities.

Even the original idea (if The Social Network is a trustworthy source) was copied -- Zuckerberg just has a complete lack of vision, but is clearly an intelligent operator with good business sense. Jagged intelligence, like an LLM.