Reducing every angle of a story to a single thread isn't going to help matters.
To take this week's AirBnB PR uproar as an example, many of the front page posts on the issue represent different facets of the story. Sure, only one link to the original blog complaint from the renter is necessary. Subsequent posts highlighting the story's path from HN to TechCrunch to a TechCrunch-hosted official response to the Financial Times and other news outlets are providing useful context here. The story has moved beyond the facts of the initial incident and onwards to its impact on startups, fundraising, disrupting regulated industries, and more.
There's a lot to talk about here and it doesn't all belong on one thread.
I think that's different than what the OP is talking about though. If different stories are providing updates to an earlier story or original information of some other kind that's fine. If there are multiple links from different sources that are duplicating the same basic information then it creates unnecessary redundancy and splinters the discussion.
To take this week's AirBnB PR uproar as an example, many of the front page posts on the issue represent different facets of the story. Sure, only one link to the original blog complaint from the renter is necessary. Subsequent posts highlighting the story's path from HN to TechCrunch to a TechCrunch-hosted official response to the Financial Times and other news outlets are providing useful context here. The story has moved beyond the facts of the initial incident and onwards to its impact on startups, fundraising, disrupting regulated industries, and more.
There's a lot to talk about here and it doesn't all belong on one thread.