This might be best tied to a system that combines all duplicate links into a single submission thread. Eg, when you try to submit link.to/really/cool/thing, you get a notice that it was previously posted in v/subverse and would you like to create a new link to the original instead of a new submission? This could then be combined with a "show submissions in original subverse only" option.
[–] ShinyVoater ago
This might be best tied to a system that combines all duplicate links into a single submission thread. Eg, when you try to submit link.to/really/cool/thing, you get a notice that it was previously posted in v/subverse and would you like to create a new link to the original instead of a new submission? This could then be combined with a "show submissions in original subverse only" option.