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Anyone willing to comment on why the previous discussion got sunk and a new one was created?

Safe to assume this post will be sunk also?

Supposedly there's something that causes threads with fierce/angry discussion to get penalized. But I imagine people were also flagging it.

Probably the comment-to-upvote-ratio flamewar detector. I believe that once a story gets more comments than it has upvotes its ranking gets dropped.

Oh really? That's curious. I wonder why an identical URL was still allowed to be posted after such a detector has gone off.