Mildly irritated by people using crossposting tools to bring over their posts from Twitter. Even if you're saying the same thing, I think it's worth writing separate posts for each platform - also applies to Facebook, Insta, LinkedIn etc. Each platform is different, and it's respectful of the different audiences to write separate posts.
@engelbart I think each post should be written in a way that respects the audience on each platform. Sometimes that can be exactly the same (but I'd still say don't use crossposting tools). Sometimes the in-jokes/terminology/hashtags are different on each platform, so that's what should drive it.