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What we need is a whitelist alternative, at least for searching spammy subjects like healthcare advice. How could this work?

One idea would be to have sites that concentrate on some topic(s) of interest, where people can submit interesting links they find directly, and where others who share those common interests can lend their support to promote the best material and share other related links they've found themselves. I know, I know, it's a radical concept, but I truly believe there's some potential there...

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