http://www.amazon.com/Davids-Sling-Marc-Stiegler/dp/06716536...
Among other things, Stiegler posits a "Zetetic Institute" that teaches people how to think better -- effectively, an "organic foods" industry for the mind.
In the Information Age, the first step to sanity is FILTERING. Filter the information; extract the knowledge.
Filter first for substance. Filter second for significance. These filters protect against advertising.
Filter third for reliability. This filter protects against politicians.
Filter fourth for completeness. This filter protects from the media.
-- Marc Stielger, David's Sling
One of the good things about twitter is if you follow content sharing people with similar interests it acts as a filter. A human filter you are exploiting, but still a pretty good filter. I'm sure somehow content aggregators can move away from a board based format and into a more heavily human filtered format. Trawling through a board is time-consuming and not nearly as well filtered as it could be.