I have a relative working at Home Depot and we just discussed this topic at length given my own recent purchase. Most of their appliance customers come in with some idea of how much money they want to spend and what basic feature set they would like. Then they are looking for a knowledgeable sales associate to explain to them the differences and benefits of the various models. They may have "heard from a friend" that a particular model was good or a particular feature was good but even that information is usually incomplete or incorrect. I would fully expect "social" results for these types of queries to result in even more misinformation.
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Honestly, such a system would be ridiculously easy to game with a botnet, so there needs to be significant work in the area beforehand.
Sure, it could be exploited, and I'm guessing that's why they haven't implemented it, but there's got to be a solution that would make it work.
I think something like this would be a cool thing for Google to test for a year (a voting system might take a while to set up properly)
Google briefly had a feature like this in their results, but they've removed it. All that's left is the Star system, which isn't quite the same.
Also, just got a Firefox addon working that provides automatic related links to most web pages. Unfortunately, it relies on search now.
But I'm sure that any sufficiently popular content-discovery tool will have a lot of spammers trying to game it. It's not easy to fight that.
Could you please elaborate?