Heard: longform 'articles' and classic threads are not interchangeable

Heard: longform 'articles' and classic threads are not interchangeable
Confirmed: longform posts (the single expandable note) and multi-tweet threads are ranked as different object types — a thread earns engagement on every tweet, a longform note earns it on one.
Rumored: longform currently under-indexes on reshares because there's no mid-content reply hook.
When to use which:
— Thread: when you want replies and bookmarks compounding across units
— Longform: when you want dwell time and the content reads worse chopped up
What it means for your reach: SEO-style explainer goes longform; story or list goes thread. Don't longform a listicle — you bury every hook after the first.