I have to disagree. More often than not, when I send someone a link to a thread, Twitter decides to show only the first post or few. There's a link to see the rest of the thread but there is zero indication as to whether this link will reveal 1 or 2 or 1,000 further posts. I forget the exact text, but it's something small like "See replies" or similar. A plain link, no icon. For someone unfamiliar with Twitter, this is completely undiscoverable and it has caused me to no longer send Twitter threads to people I know that aren't on Twitter because of the confusion it causes.

For me, I have no problem reading threads on Twitter. I look forward to the daily one from Foone. But if you put someone who hasn't used Twitter much before in front of this interface it becomes apparent very quickly how poor the UX is for threads.

Right now, we're discussing the various symbols people put in their posts (which are severely space-limited!) to indicate that there is a thread. Why is this necessary?