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[–] ShinyVoater 0 points 0 points (+0|-0) 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.