I think international users are just less likely to post local stuff outside of designated communities, because even if there are more international users then they know, 99% will not care about their local issue. For example a swede is less likely to share swedish news and meme, because it is either inaccessible or irrelevant for non swedes, whether they are American or not. But english speaking content is likely to be accessible to most non swedes and swedes.

Americans however mostly don’t share this consideration and just post America specific stuff everywhere.