Yeah, good question. Most of the threads I see are marked e.g. 1/, 2/, without a set end number, so yeah, I would expect that most ones that DO have it are comp

Yeah, good question. Most of the threads I see are marked e.g. 1/, 2/, without a set end number, so yeah, I would expect that most ones that DO have it are composed in advance. (Although maybe not always posted all at once, because people definitely do still elaborate & extend on points and sometimes overrun their "pre-written script"). For example one Twitter user I follow who I most expect to write his threads ahead of time is Bret Devereaux, since he has significant long-form blog experience where he puts a lot of thoughts into high-level structure, pedagogy, etc. However, this thread of his from this morning does't have a set end-point: https://twitter.com/BretDevereaux/status/1610457226451484672 https://twitter.com/BretDevereaux/status/1610457226451484672. I wonder how it was composed?