The vast vast vast vast majority of people use “American” social network because they are the social networks that exist. The US is undeniably the main exporter of SaaS products. See: the incumbents freaking out that China is getting a turn in the front seat. I’ve never once heard of anyone seeking ‘American tech’, except for some punchline in an anti-Soviet joke or movie.
Foreign nationals can comment about American politics because the US doesn’t have jurisdiction over their speech, notwithstanding the back and forth over whether social media companies are liable for disseminating such content in the first place.
A material part of why the USA is seen as The Country in Western culture, and a noted big player in other cultures, is because of the power it projects via the media. That includes both Hollywood exports, and social media.
