I know, I'm not the first to talk about this idea, but I haven't found anything useful which is less than a couple of years old...
It seems that vast majority of questions which need to be closed should be closed as duplicates and recently I'm trying to commit to finding a good duplicate when I can. However, everyone knows it is a tiresome and not rewarding task, so there should be a way to facilitate this. I started to make a list of good duplicate questions for my personal use (as of a week ago), but now I think there must be a better and more productive way than just copypasting links in a text file and adding a few comments.
So, is there maybe already a place where people are accumulating such questions collaboratively? If not, is there a nice platform to have such a database (with tagging abilities, good search, etc) where active community members could contribute such things? Can it be done within the existing SO / meta system?