http://news.ycombinator.com/item?id=2402027
politics? I don't think so. Economic inequality is a very interesting social phenomenon, though it is often written about in a heated/political way.
If readers are willing to tag stories not just as "good" or "bad" but with categorical labels, then suddenly the news aggregator "knows" a lot more about the data its serving up. You could have categories at the top, preferential sorting for users, and more.
Note this discussion is exactly akin to deletionism on wikipedia – if we can categorise information effectively, why reject any of it?