But if we look at the "mainstream" usage, like English-language thought leaders, they are still there, still posting regularly. Like for example in the AI field, all relevant people are on twitter.
Discoverability there is, of course, harder. At least initially, but just like twitter once I see someone making interesting replies, or someone in my follows boosts them, I tend to follow them faster (and drop them faster if their smart reply was a fluke).
Twitter’s second largest market is Japan, with Saudi Arabia ranking fourth, Brazil, Turkey, India, Indonesia, and Mexico all in the top 10[1]. While a lot of people prefer to Tweet in English, I can confirm that Twitter has a healthy amount of content in other languages if you want to go find it.
[1] https://www.newsweek.com/countries-most-people-twitter-socia...