That's a tricky thing to protect against. You'd almost have to fetch all pages and do a content comparison a la google news to see what goes together.
This sort of mixup happens all the time.
And sometimes that's even good, when an interesting subject scrolls off the newpage before it receives any votes. Then a few days later someone will post the same news from a different source and suddenly it makes the homepage.
I agree that's it's not necessarily avoidable, and it's not necessary to avoid. I do think, however, that it's useful to cross-reference the items so people can read all the relevant comments.
Not everyone agrees, I occasionally get down-mud, and I'm not as anal about it as I once was. Waba Sabi, and all that.
It's not a joke, it's the same underlying story, but written by two different writers. They are, however, the same underlying story, so I thought anyone interested might like to compare and contrast the two articles. More, some might comment on one, others on the other, so it was worth cross-referencing them.
I have no preference, I'm trying to add value by creating connections, and preventing subsequent comment duplication.
