At search.twitter, the results snippets have the "show conversation"
link that uses AJAX to open up the full thread of replies to the tweet
at hand. I found a URL structure that corresponds to that
functionality (
http://search.twitter.com/search/thread/[status_ID]),
but it's not a styled, user facing page and doesn't appear to have a
feed associated with it. Is their a better URL for threads and/or a
feed for them? Is the full thread for a specific tweet part of the API
yet, or soon?
My apologies, I've asked this before and gotten answers but couldn't
find my post. Probably a duplicate here.