Seriously, why are people still using twitter? It's owned by a Nazi supporter, is full of white nationalist racist posters, and seems a strange place to announce you are moving off of American tech.
Politicians use it a lot. Because media and journalist started using it.
Because for better or worse it still has significance and popularity. Nothing else really comes close.
Because they EU still can't make software and most people in America don't care.
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Not to mention JD Vance uses it so it's like sharing a room with a massive dog turd