Is it? There are a quite a few high-quality blogs I read (via RSS feeds, of course), but I usually discover them via aggregators such as HN, Reddit, Metafilter

Is it? There are a quite a few high-quality blogs I read (via RSS feeds, of course), but I usually discover them via aggregators such as HN, Reddit, Metafilter, etc. I've found Facebook and Twitter to be a terrible way to identify high-quality content sources: they ironically lack the social-filter function. It's the cultural norms of a community like HN, combined with its also socially-mediated ranking mechanism, that enable aggregators to function so well as content filters. Facebook and Twitter are disjointed in that no one is taking to precisely the same group of people, and there's no evaluative mechanism at all: if someone you follow posts it, it shows up on your front page. Linear flow of all information is exactly what you get. Facebook is excellent as a glorified contact list, but I still can't found a purpose for Twitter in my life. Reddit is the real winner: the subreddits are coherent communities, and they can be viewed and subscribed to independently of each other, so you're joining a community of communities, each with its own content-filtering mechanism. Of course, Reddit is essentially a modern version of USENET.