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But how much of the online world are we?
English speaking? Pretty big. There's also vast portions of the internet that are not in English, but if you don't speak anything besides English, chances are you're not going to come across it too much.
English-speaking population is about 1.5 billion worldwide and 300 million of that is in the US (first language or additional language), so the US is about 20% of the world's English speakers. The 2nd and 3rd countries with the most English-speakers are India and Nigeria, so factor in internet access, and the US is almost certainly >20% of the English-speaking internet.
Source: https://en.wikipedia.org/wiki/List_of_countries_by_English-speaking_population
I'd like to see stats on that, because there are equally many 2nd language speakers in English speaking spaces as well. Not to mention the brits, irish, aussies, kiwis, canadians, etc, and that's before we get into this list of places with a non majority first language population, like many countries in Africa.
I think the percentage of Americans on the internet will be higher, but still not a majority
People are speaking English because that is an internationally known language. Americans assume that when people speak English on the internet, it must mean that they are American. It is not even remotely true though, Americans are a minority on the internet, including the "English speaking" internet, they are just never aware of it.
About 4.2%.