No, a thread is a chain of replies. Clients need to be smart enough to display them in a flat way, even though the structure is nested. Twitter got that right.
Discussion
I flatten the thread as you can see here so I account for both:


my layout displays threads either chained or not, but I still think structurally / hierarchically, the information flow should not be nested. just how my brain works...¯\_(ツ)_/¯